Contact OnlyOne: Phone, Email, Chat and All Contact Details for the Green Neobank Key Facts

• Customer service phone: Not available — contact via the official website
• Service hours: Monday-Friday, 9am-6pm
• Languages: French, English, Spanish
• Contact methods: Phone, Email, Mobile App, Live Chat

About Contact OnlyOne: Phone, Email, Chat and All Contact Details for the Green Neobank

Contact OnlyOne: Phone, Email, Chat and All Contact Details for the Green Neobank

Are you looking to contact OnlyOne by phone or obtain the customer service contact details for this French ecological neobank? You are in the right place. In this comprehensive guide, we detail all the ways to reach OnlyOne, its offers, fees, features and much more. Whether you want to get the OnlyOne phone number, report a lost card or simply learn more about this fintech committed to the planet, this article will answer all your questions.

OnlyOne is a French neobank founded in 2018 by Kamel Naït-Outaleb and Matthias Rouberol. It stands out for its strong environmental commitment: every transaction with your card helps finance reforestation and biodiversity protection projects. Registered with the ACPR (Autorité de Contrôle Prudentiel et de Résolution) under REGAFI number 85585, OnlyOne operates as a licensed payment institution, with funds guaranteed by Société Générale up to 100,000 euros per customer.

Important clarification from the outset: OnlyOne does not have a public phone number. As a 100% digital neobank, all customer support goes through the OnlyOne application. This is a deliberate choice that reduces costs and enables more responsive service via the integrated chat. If you are looking for the OnlyOne phone number, note that the preferred way to reach an advisor is directly through the mobile application. We will detail all available contact channels in the dedicated customer service section.

1. Background and History of OnlyOne

The story of OnlyOne begins in 2018, at a time when environmental awareness was accelerating in France and across Europe. Kamel Naït-Outaleb, drawing on 17 years of experience in traditional banking, decided to leave his position to found a radically different neobank. His observation was simple yet powerful: when you deposit your money in a traditional bank, you do not know how it is being used. According to reports from Friends of the Earth and Oxfam, major French banks heavily finance fossil fuel industries, to the tune of tens of billions of euros each year.

Kamel Naït-Outaleb partnered with Matthias Rouberol, a technology entrepreneur, and Amine Melouk to create the first positive-impact current account in France. The founding idea was ambitious: reposition banking at the heart of society and the real economy, giving customers complete transparency on how their funds are used and financing environmental projects with every transaction.

The company was officially incorporated in 2018, with the commercial launch taking place in 2020 after obtaining the necessary licenses from the ACPR. OnlyOne chose Société Générale as its banking partner for deposit guarantees, while maintaining total independence in the management of its customers' funds. This structure ensures that money deposited by users does not finance fossil fuels.

In terms of growth, OnlyOne quickly attracted a community of customers who are passionate about climate issues. The neobank was supported by several investors and made a name for itself within the French Tech ecosystem. In 2022, OnlyOne announced a 35 million euro investment commitment from Global Emerging Markets (GEM), an international investment fund. This announcement marked an important milestone for the neobank, which aimed to expand its services and broaden its offering to new European markets.

OnlyOne has also been recognized by several organizations. The fintech was notably referenced by PwC France as an example of a positive-impact fintech, and its founder Kamel Naït-Outaleb was interviewed by Forbes France to present the company's vision. The company also established a partnership with the United Nations UNITLIFE fund, strengthening its credibility in terms of social and environmental impact.

However, like many fintechs, OnlyOne went through difficult periods. The neobank was placed into judicial liquidation in February 2025, a victim of an extremely competitive market and the difficulty of making a low-margin banking model profitable. But the story does not end there: in November 2025, La Nef, a historic French ethical cooperative bank, acquired OnlyOne's assets to create Nef Lab, a structure dedicated to accelerating its digital transformation. This acquisition ensures the continuity of OnlyOne's philosophy while providing the financial backing of a cooperative banking institution established for over 30 years.

If you wish to contact OnlyOne for more information about this transition or about the status of your account, the method remains the same: go through the OnlyOne application to reach customer service. There is still no public OnlyOne phone number, but advisors are accessible via the integrated chat within the application.

The market targeted by OnlyOne consists of environmentally conscious French individuals, primarily those aged 18-45, including students, young professionals and anyone wishing to give meaning to their money. With the acquisition by La Nef, the ambition is now to combine OnlyOne's digital expertise with the network and financial strength of a cooperative bank to reach an even wider audience.

2. OnlyOne Offers and Fees

OnlyOne's fees are characterized by their simplicity and transparency. Unlike traditional banks that multiply billing lines, OnlyOne offers a clear and readable pricing structure. Here is a complete breakdown of the available offers and associated OnlyOne costs.

The Three OnlyOne Account Plans

OnlyOne offers three types of accounts, all based on the same features but with differentiated pricing based on the customer's profile:

• Impact Account (standard offer): 6 euros per month, or 58 euros per year (a 20% saving). This is OnlyOne's flagship offer, intended for individuals over 25 seeking a complete and ethical current account.
• Youth Account (18-25): 3 euros per month, or 29 euros per year. This reduced-rate offer is specifically aimed at young adults and represents excellent value for money in the green neobank market.
• ISIC Account (students): 36 euros per year (annual payment only). This account combines the OnlyOne payment card with the ISIC international student card, recognized by UNESCO, offering over 150,000 discounts in 130 countries.

Note: all these accounts include the same core features. The only difference lies in the pricing and, for the ISIC offer, the associated student benefits. Opening an OnlyOne account is free and done entirely from the mobile application in a few minutes.

Detailed Current Fees

Here is the breakdown of current fees applicable to all OnlyOne accounts:

• Monthly subscription: €6/month (standard), €3/month (youth), €36/year (ISIC)
• Mastercard bank card made from recycled plastic: first card free, included in the subscription
• Virtual card: first virtual card free, then €0.50 per additional virtual card
• Payments in the euro zone: free and unlimited
• Payments outside the euro zone: free, with no foreign exchange surcharge
• Withdrawals in the euro zone: 2 free withdrawals per month, then €1.50 per additional withdrawal
• Withdrawals outside the euro zone (Europe): 1.5% of the amount withdrawn
• International withdrawals: 2.5% of the amount withdrawn
• SEPA transfers: free
• Instant transfer: free, but only between OnlyOne accounts
• Savings vaults: 2 vaults free, then €0.20 per month per additional vault
• Card block (loss/theft): €12
• Card renewal at expiry: €10
• Card renewal before expiry: €15
• Direct debit rejection: 1 free rejection per month, then €6 per rejection
• Direct debit block: €1 per rejection
• Account statement by mail: €5
• Garnishment (notice to third-party holder): €50
• Bailiff garnishment: €80
• Overdraft interest / authorized overdraft: not applicable (no authorized overdraft)
• Intervention fee: not applicable

OnlyOne's fees are therefore particularly competitive for standard everyday use. In comparison, the average cost of a current account at a traditional French bank is approximately 215 euros per year, more than three times the annual OnlyOne offer. To check the latest fee details or ask a question about charges, you can contact OnlyOne directly through the OnlyOne application — remember that there is no OnlyOne phone number available.

Payment and Withdrawal Limits

The limits for the OnlyOne Mastercard are as follows:

• OnlyOne payment limit: €2,000 per transaction, €2,000 over 24 hours, €3,000 per week, €5,000 per month, €60,000 per year
• OnlyOne withdrawal limit: €500 per withdrawal, €500 over 24 hours, €1,000 per week, €2,000 per month, €20,000 per year
• Transfer limit: €2,000 per transfer, €5,000 per month

If you wish to increase your OnlyOne limit, you can contact customer service via the application to request a temporary or permanent adjustment of your limits, subject to approval. For any limit increase request, use the chat in the OnlyOne application: this is the fastest channel.

3. OnlyOne Features

The OnlyOne mobile application is the heart of the customer experience. Available on iOS (App Store) and Android (Google Play), it centralizes all banking operations and management tools. Here is a complete overview of the features offered by this OnlyOne neobank.

The OnlyOne Bank Card

The OnlyOne bank card is an international Mastercard Debit card made from over 85% recycled plastic. This is a choice consistent with the neobank's environmental philosophy. The card operates on immediate debit (systematic authorization), meaning each transaction is verified in real time against the available balance in your account. This prevents any accidental overdraft.

Card features:

• Type: International Mastercard Debit
• Material: 85% recycled plastic
• Contactless payment: yes (NFC)
• OnlyOne Apple Pay: compatible
• OnlyOne Google Pay: compatible
• Virtual card for online purchases: included free
• Free home delivery
• Activation and deactivation from the application
• PIN code customization

In case of OnlyOne card loss or OnlyOne card theft, you can immediately block your OnlyOne card from the application. Reporting a lost OnlyOne card is done in seconds via the dedicated menu in the app. For a phone card block with OnlyOne, note that there is no dedicated phone number for blocking: everything is managed through the OnlyOne application. That said, the blocking is instantaneous since you control your card in real time from your smartphone.

Transfers and Everyday Operations

OnlyOne offers all standard banking operations:

• SEPA transfers: sending and receiving transfers within the SEPA zone, free of charge
• OnlyOne instant transfer: available free of charge between OnlyOne accounts
• OnlyOne international transfer: the non-SEPA transfer service is under development. For now, OnlyOne focuses on the SEPA zone
• Receiving transfers: your account has a French OnlyOne IBAN and a complete OnlyOne RIB to receive salaries, social benefits and any incoming transfers
• OnlyOne BIC SWIFT: the BIC code is provided with your RIB for international transactions
• Automatic direct debits: ability to set up SEPA direct debits (rent, subscriptions, etc.)

To modify your OnlyOne RIB or obtain your banking details, go to the "My Account" section of the application. Your RIB can be downloaded as a PDF directly from the app. The OnlyOne transfer time for a standard SEPA transfer is generally 1 to 2 business days, in line with European banking standards.

The Mobile Application and Management Tools

The OnlyOne customer area is entirely accessible via the mobile application. Here are the main management tools available:

• Automatic expense categorization: each transaction is automatically classified by category (groceries, transportation, entertainment, etc.) to give you a clear view of your spending habits
• Eco-coach: OnlyOne's flagship tool, which calculates the carbon footprint of each transaction in real time using the ADEME (Agency for Ecological Transition) database. You can compare your footprint with the French average and that of other OnlyOne users
• Savings vaults: create themed sub-accounts to save by goal (vacation, property purchase, emergency fund, etc.). Two vaults are included free of charge
• Automatic round-up savings: activate this feature to round up each payment to the nearest euro and automatically place the difference in a vault of your choice
• External account aggregation: connect your other bank accounts for an overview of your finances from the OnlyOne application
• Real-time notifications: receive a push notification for each transaction, incoming transfer or important account event
• Les Ones: a digital token system representing the interbank commissions generated by your payments. OnlyOne redistributes 100% of these commissions as Ones that you allocate to partner associations of your choice
• Card management: instant activation/deactivation, PIN code modification, temporary block, contactless payment activation, limit management

To download the OnlyOne application, go to the App Store (iOS) or the Google Play Store (Android). Registration takes a few minutes and only requires a smartphone and a valid ID. If you encounter a technical issue with the application or need help setting up a feature, the fastest way is to use the integrated chat in the OnlyOne application.

Regarding the OnlyOne foreign IBAN, note that OnlyOne exclusively provides a French IBAN (starting with FR), which facilitates income domiciliation in France and avoids the IBAN discrimination issues that some customers of foreign neobanks encounter.

4. Additional Services

Beyond the current account and bank card, OnlyOne offers several additional services that enrich the user experience and reinforce the environmental impact of each customer.

La Place Impact: Responsible Savings and Investment

La Place Impact is a marketplace integrated into the OnlyOne application that brings together savings and investment solutions selected for their positive environmental and social impact. It is organized into four categories:

• Save: access to ethical savings solutions, including the possibility of becoming a tree owner in sustainably managed forests by EcoTree, a French forestry management company. You can also invest your savings in funds that exclusively invest in environmentally responsible companies
• Invest: access to responsible life insurance solutions, such as the one offered by Goodvest, a contract aligned with the goals of the Paris Agreement. You can also invest in positive-impact startups and SMEs, or finance projects in your region through interest-bearing loans
• Insure: partnerships with ethical and transparent insurers to cover your home, mobile phone and other assets, with contracts that are fairer and more transparent than traditional insurers
• Everyday life: access to green and local electricity providers, food waste reduction solutions, eco-friendly and solidarity gift cards, and many other committed partners

OnlyOne's cashback takes an original form at this neobank: rather than classic monetary cashback, OnlyOne redistributes interbank commissions as Ones that you can allocate to associations. It is a positive-impact cashback model that distinguishes OnlyOne from its competitors.

Referral and Welcome Offer

The OnlyOne referral program allows existing customers to invite their friends and family to open an OnlyOne account. Both the referrer and the referred benefit from advantages, generally in the form of free subscription months or bonus Ones. To check the current conditions of the OnlyOne welcome offer and referral program, consult the dedicated section in the application or contact customer service via chat.

Solutions for Professionals

OnlyOne had long been working on developing a professional offer. The OnlyOne business account and OnlyOne professional account were in beta testing before the company's restructuring. The goal was to offer OnlyOne micro-entrepreneurs and OnlyOne auto-entrepreneurs an ethical professional banking solution, combining business management features with the environmental commitment that defines OnlyOne.

With the acquisition by La Nef, the development of the professional offer could be relaunched in a new form, benefiting from La Nef's expertise in financing the social and solidarity economy. If you are a professional and wish to be informed about the launch of this offer, contact customer service through the OnlyOne application to join the waiting list.

Credit and Overdraft

OnlyOne does not offer consumer credit or authorized overdrafts. This is a deliberate choice: the neobank believes that over-indebtedness is a major social problem and prefers to encourage responsible financial management. The absence of overdrafts protects customers from interest charges and debt spirals. However, via La Place Impact, it is possible to access crowdfunding or microcredit solutions offered by selected partners.

5. Security

OnlyOne account security relies on a set of technical and regulatory measures that guarantee the protection of customers' funds and personal data.

Licensing and Regulatory Compliance

OnlyOne is registered with the ACPR (Autorité de Contrôle Prudentiel et de Résolution) under REGAFI number 85585. The ACPR is the French banking and insurance supervisory authority, attached to the Banque de France. This registration ensures that OnlyOne complies with the prudential and operational standards in force in the French and European financial sector.

Customer funds are deposited in a segregated account with Société Générale, meaning they are isolated from OnlyOne's own assets. In the event of the neobank's failure, customer funds remain protected and guaranteed by Société Générale up to 100,000 euros per customer, in accordance with the Fonds de Garantie des Dépôts et de Résolution (FGDR).

GDPR Compliance

OnlyOne fully complies with the General Data Protection Regulation (GDPR) in effect in the European Union since May 2018. This means:

• Your personal data is never sold to third parties
• You can exercise your right to access, rectify and delete your data at any time
• Data processing is limited to what is strictly necessary to provide banking services
• A Data Protection Officer (DPO) is designated to oversee GDPR compliance
• Data is hosted on secure servers in Europe

PSD2 Compliance

OnlyOne complies with the European PSD2 directive (Payment Services Directive 2), which strengthens the security of online payments and opens up the banking market. This compliance includes:

• Strong Customer Authentication (SCA) for online payments and sensitive operations
• The ability for the customer to authorize third-party services (account aggregators, payment initiators) to access their banking data securely via standardized APIs
• Enhanced security standards for communications between different actors in the payment chain

Two-Factor Authentication and Application Security

OnlyOne two-factor authentication (2FA) is enabled by default for all sensitive operations. Specifically, this means:

• Logging into the application requires a PIN code or biometric authentication (fingerprint, facial recognition)
• Online payments are secured by in-app validation (3D Secure)
• Transfers to new beneficiaries require additional confirmation
• Changes to sensitive data (email, phone number) are protected by enhanced verification

If you have forgotten your OnlyOne PIN code, you can reset your PIN directly from the application by following the identity verification procedure. If you encounter difficulties, customer service is reachable via the chat in the OnlyOne application to guide you through the process.

Data Encryption

Communications between your smartphone and OnlyOne's servers are encrypted using TLS 1.3, the latest and most secure encryption protocol. Data stored on servers is also encrypted at rest (AES-256), ensuring that even in the event of unauthorized server access, the data remains unreadable.

Anti-Fraud Measures

OnlyOne deploys a real-time fraud detection system that analyzes each transaction to identify suspicious behavior. In case of an unusual transaction, the system can:

• Temporarily block the transaction
• Send a notification to the customer for confirmation
• Preemptively block the card
• Alert the security team for investigation

To report fraud or an unauthorized transaction, immediately contact customer service through the OnlyOne application. In the absence of a dedicated OnlyOne emergency number, the integrated chat remains the fastest channel to report a security issue. You can also instantly block your OnlyOne card from the application, without waiting for an advisor.

6. OnlyOne Customer Service

How do you contact OnlyOne by phone? This is the question many customers and prospects ask. The answer is clear: OnlyOne does not offer a public phone number. As a 100% digital neobank, all customer support is centralized in the mobile application. Let us detail the various available contact channels and service quality.

The Integrated Application Chat

The main channel to reach OnlyOne is the OnlyOne online chat integrated into the mobile application. This chat connects you directly with a human advisor (not a chatbot) during customer service opening hours. The advantages of this channel are numerous:

• Generally fast response time (a few minutes during business hours)
• Conversation history preserved for easier follow-up
• Ability to send attachments (screenshots, documents)
• No phone waiting or hold music

If you are looking to reach an OnlyOne advisor, the chat is by far the most effective method. Advisors are trained to handle all types of requests: account questions, technical issues, modification requests, complaints, etc.

Contact by Email

The OnlyOne contact email is a complementary option to the chat. You can write to customer service via the email address provided in the application or on the onlyonecard.eu website. Email is particularly suited for:

• Complex requests requiring document attachments
• Formal complaints
• Questions that do not require an immediate response

The email response time is generally 24 to 48 business hours. For the OnlyOne complaints service, email is the appropriate channel for formalizing a complaint and obtaining written follow-up.

Why No Phone Number?

If you are looking for the OnlyOne customer service phone, the OnlyOne tel, the OnlyOne customer service tel, the OnlyOne customer service telephone, or the OnlyOne service customer tel, note that this choice not to offer phone support is common to most neobanks. Here is why:

• Cost reduction: a call center represents a considerable expense. By eliminating it, OnlyOne can maintain low fees
• Traceability: written exchanges (chat, email) create a reviewable history, which prevents misunderstandings
• Efficiency: chat allows the advisor to handle multiple requests simultaneously, reducing wait times
• Documentation: attachments, screenshots and links can be shared instantly via chat

In summary, to call OnlyOne, call OnlyOne customer service, call OnlyOne's customer service, call OnlyOne service or call OnlyOne, the answer is always the same: go through the OnlyOne application. There is no OnlyOne toll-free number, toll-free OnlyOne number, or OnlyOne non-premium number — simply because there is no phone line at all.

Customer Service Hours

OnlyOne's customer service opening hours are as follows: the chat is generally available Monday through Friday, during business hours (approximately 9 AM to 6 PM, Paris time). Outside these hours, you can leave a message via the chat or by email, and an advisor will respond when the service resumes.

For urgent situations outside of hours (lost or stolen card), note that blocking your OnlyOne card is available 24/7 directly from the application, without advisor intervention. This is actually one of the major advantages of a digital neobank: you retain total control of your card at all times.

Support Quality

Customer reviews of OnlyOne's customer service are predominantly positive. Users particularly highlight the responsiveness of advisors and the quality of the answers provided. Several testimonials mention response times of under 10 minutes during business hours, which is remarkable for a neobank of this size.

However, a few areas for improvement are regularly mentioned: the lack of phone support can be frustrating for customers who are less comfortable with digital tools, and response times can increase during peak periods. Some customers also mention that the chat is not available on weekends, which can be problematic for emergencies occurring outside business days.

To speak with an OnlyOne advisor, reach a real OnlyOne advisor, talk to OnlyOne's real advisor or speak to a real OnlyOne advisor, the application chat remains your best option. The advisors are real humans, not bots, and they are able to handle the vast majority of requests during the first exchange.

Physical Branches

Regarding nearby OnlyOne branches, note that OnlyOne has no physical branches. This is the very principle of a 100% digital neobank: everything is done from the mobile application, which reduces operating costs and enables more competitive pricing. If you are looking for in-person support, OnlyOne may not be the ideal solution, and we recommend turning to online or traditional banks with branch networks.

Summary of Contact Channels

To summarize all possibilities for OnlyOne telephone contact, OnlyOne phone contact and contacting OnlyOne by phone, here is a summary:

• Online chat: via the OnlyOne application, Monday to Friday, during business hours — main and fastest channel
• Email: via the address provided in the application — for complex requests and complaints
• Phone: not available — OnlyOne does not offer a phone number
• Branch: not available — 100% digital neobank
• Social media: OnlyOne is present on Facebook, Instagram and LinkedIn — complementary channel for general questions

If you are trying to find the OnlyOne customer service phone, the OnlyOne service customer phone, the OnlyOne customer phone, the OnlyOne phone number, the OnlyOne telephone number, the OnlyOne phone number, or the OnlyOne phone number, we confirm: none of these numbers exist. Everything goes through the OnlyOne application.

7. OnlyOne Customer Reviews

OnlyOne customer reviews are a valuable indicator of this green neobank's service quality. Here is a comprehensive overview of ratings and feedback on the main review platforms.

Ratings on App Stores

The OnlyOne mobile application receives very honorable ratings on the stores:

• App Store (iOS): 4.7/5 (approximately 70 reviews) — This is an excellent rating reflecting the satisfaction of iPhone users. Comments highlight the smooth interface, the relevance of the eco-coach and the ease of everyday use.
• Google Play (Android): 4.3/5 (approximately 130 reviews) — Also a very good rating, slightly lower than the App Store. Some Android users mention occasional bugs, but the overall experience remains satisfactory.

Trustpilot Rating

On Trustpilot, OnlyOne has a rating of 3.8/5 based on approximately 38 reviews. The breakdown shows that about 80% of reviews are 5 stars, which is remarkable. The remaining 20% are split between mixed and negative reviews, often related to specific situations (requests for additional documentation, transfer delays, etc.).

Positive Review Trends

The points most frequently cited positively in OnlyOne customer reviews are:

• Sincere environmental commitment: customers appreciate that OnlyOne does not just engage in greenwashing but proposes concrete actions (reforestation, green project financing, eco-coach)
• Transparency: users praise the clarity regarding fund usage and the simple pricing structure
• Customer service quality: despite the absence of phone support, advisors via chat are described as responsive, competent and caring
• The eco-coach: a highly acclaimed feature that helps raise awareness of one's daily carbon footprint
• Easy account opening: a fast, fully digital process, operational in minutes
• Competitive pricing: monthly fees are considered reasonable, especially compared to traditional banks

Negative Review Trends

The most frequently mentioned areas for improvement:

• Limited number of free withdrawals: only 2 per month, which may be insufficient for users who regularly withdraw cash
• Foreign withdrawal fees: 2.5% outside the euro zone, which disadvantages frequent travelers
• Lack of proprietary interest-bearing savings: vaults do not generate interest, and savings go through external partners
• High card block fees: €12 for a card block, which is above some competitors
• No universal instant transfers: instant transfers only work between OnlyOne accounts
• Documentation requests: some customers find KYC (Know Your Customer) procedures burdensome, even though they are legally required

Reviews from Specialist Websites

Financial comparison websites generally have a positive view of OnlyOne:

• Finance Héros: very positive review, highlighting the quality of the eco-coach and the sincerity of the environmental commitment
• MoneyRadar: 4/5 rating, ranked 6th among the best neobanks, with a special mention for the green tools
• ConnectBanque: favorable review, appreciating the total transparency and French RIB
• Les Numériques: detailed presentation of the positive-impact account concept

8. Comparison with Competitors: Helios, Green-Got and bunq

To better situate OnlyOne in the green neobank market, let us compare it with three direct competitors: Helios, Green-Got and bunq. This comparison will help you choose the solution best suited to your needs.

OnlyOne vs Helios

Helios is often considered the leader of green neobanks in France, with approximately 19,000 customers. Here are the main differences with OnlyOne:

• Pricing: Helios offers a plan at €6/month (identical to OnlyOne) but also offers a joint account, which OnlyOne lacks
• Bank card: Helios stands out with its natural cherry wood card, while OnlyOne opts for recycled plastic. Both choices have a positive environmental impact, but the "wow" effect of Helios' wooden card is often cited
• Green features: OnlyOne has the eco-coach and La Place Impact, while Helios highlights its "Helios Score" and its directly financed energy transition projects
• Free withdrawals: Helios offers 3 free withdrawals per month compared to 2 for OnlyOne
• Card block fees: free at Helios, €12 at OnlyOne
• Direct debit rejection fees: €1 at Helios, €6 at OnlyOne (after the first free one)
• Customer service: both neobanks primarily operate via chat, with no public phone number
• Licensing: Helios is an agent of the Solarisbank payment institution, while OnlyOne is directly registered with the ACPR

Verdict: Helios wins on incident fees and offer diversity (joint account), while OnlyOne stands out with its responsible investment tools (La Place Impact) and the ISIC student offer.

OnlyOne vs Green-Got

Green-Got is another French impact neobank, founded by Maud Caillaux, Fabien Music and Andréa Ganovelli. It has raised approximately 5 million euros and claims around 25,000 customers.

• Pricing: Green-Got offers a plan at €6.90/month, slightly more expensive than OnlyOne (€6/month)
• Bank card: Green-Got offers a biodegradable corn starch card, an interesting environmental choice
• Green features: Green-Got emphasizes transparency of its carbon footprint and financing of ecological transition projects. Like OnlyOne, Green-Got offers an integrated carbon footprint calculator
• International payments: Green-Got offers fee-free international payments, like OnlyOne
• Savings: Green-Got is also working on responsible savings solutions, with partnerships similar to OnlyOne's La Place Impact
• Customer service: support by chat and email, no public phone number (same model as OnlyOne)

Verdict: Green-Got and OnlyOne are very similar in their approach. OnlyOne is slightly cheaper and has an attractive student offer (ISIC), while Green-Got stands out with its biodegradable card and a rapidly growing community.

OnlyOne vs bunq

bunq is a Dutch neobank founded in 2012 by Ali Niknam, with a different positioning from French green neobanks. Present in many European countries, bunq stands out with a more technology-driven approach.

• Pricing: bunq offers several plans, including a free offer (Easy Bank) and premium offers up to €17.99/month (Easy Money). The pricing range is broader than OnlyOne's
• Features: bunq offers more traditional banking features (unlimited sub-accounts, international transfers, integrations with third-party services), but environmental commitment is less central than at OnlyOne
• IBAN: bunq provides a Dutch IBAN (NL), which can cause IBAN discrimination issues in France. OnlyOne provides a French IBAN, which is a significant advantage for French residents
• Bank card: bunq offers standard plastic Mastercard cards, without OnlyOne's recycled dimension
• Environmental commitment: bunq plants a tree for every €100 spent, which is a notable commitment but less integrated than OnlyOne's complete model (eco-coach, La Place Impact, Ones)
• Withdrawals: bunq offers unlimited free withdrawals on certain plans, a clear advantage over OnlyOne which limits free withdrawals to 2 per month
• Customer service: bunq offers multilingual support via in-app chat, similar to OnlyOne but with broader hours coverage

Verdict: bunq is more versatile and richer in banking features, but OnlyOne wins clearly on environmental commitment and the ecological coherence of its offer. For a French customer wanting a French IBAN and maximum environmental impact, OnlyOne remains the most relevant choice.

Summary Comparison Table

• OnlyOne: €6/month — Recycled plastic Mastercard — French IBAN — Eco-coach + La Place Impact + Ones — 2 free withdrawals/month — Free payments outside the EU — Trustpilot rating 3.8/5
• Helios: €6/month — Cherry wood Visa — French IBAN — Helios Score + transition projects — 3 free withdrawals/month — Free payments outside the EU — Joint account available
• Green-Got: €6.90/month — Corn starch Mastercard — French IBAN — Carbon calculator + green projects — 2 free withdrawals/month — Free payments outside the EU — Growing community
• bunq: €0 to €17.99/month — Plastic Mastercard — Dutch IBAN — 1 tree/€100 — Unlimited withdrawals (premium plans) — Advanced banking features — Broad European presence

Whichever you ultimately choose, note that contacting each of these neobanks follows a similar model: everything goes through the mobile application. If you wish to reach OnlyOne by phone, reach an OnlyOne advisor or reach an OnlyOne advisor, the chat in the OnlyOne application remains the only available channel.

9. Case Studies: OnlyOne Customer Testimonials

To illustrate the OnlyOne experience in practice, here are three case studies of customers with varied profiles.

Case Study 1: Sophie, 28, Freelance Graphic Designer in Lyon

Sophie is a freelance graphic designer who has been passionate about environmental issues since her studies at the Beaux-Arts. She was looking for an alternative to her traditional bank after discovering that it was heavily financing fossil fuel industries.

"I discovered OnlyOne in 2022 through a friend's Instagram post. The idea of an account that doesn't finance oil immediately appealed to me. Opening the account took less than 10 minutes from my phone, and I was able to use my virtual card immediately for online purchases. What I appreciate most is the eco-coach: seeing the carbon footprint of my spending made me realize that my taxi rides represented a huge part of my impact. I started cycling and reduced my footprint by 30% in six months. The only downside for me is that I would have liked to use OnlyOne as a business account for my micro-enterprise. I hope the business offer will arrive soon. In the meantime, I recommend OnlyOne to all my creative friends who want to give meaning to their money."

Sophie primarily uses the OnlyOne mobile application to manage her personal finances. She activated automatic round-ups and accumulated over 200 euros in savings in a year without even thinking about it. For questions she had about savings vaults, she used the application chat and received an answer in less than 5 minutes.

Case Study 2: Thomas, 22, Business School Student in Paris

Thomas is a final-year master's student who regularly participates in university exchanges abroad. He chose OnlyOne's ISIC offer to combine his student card and payment card.

"As a student, price is a decisive criterion. At 36 euros per year, OnlyOne's ISIC offer is unbeatable. I have my bank card and my international student card on the same card, which is really practical. During my Erasmus semester in Barcelona, I could pay everywhere without additional fees in the euro zone, which saved me quite a bit of money compared to my previous bank. The ISIC discount program also got me discounts at museums, restaurants and even train tickets. The only negative point is withdrawals: only 2 free per month, which is a bit tight when you're abroad and some shops don't accept cards. But overall, I'm very satisfied and have already referred three classmates."

Thomas used the OnlyOne referral program to invite his friends and benefited from free subscription months. He particularly appreciates the OnlyOne Apple Pay feature, which allows him to pay with his iPhone without taking out his physical card. Regarding how to open an OnlyOne account, he confirms the process is ultra-simple: "Five minutes, a photo of my ID card and a selfie, and it was done."

Case Study 3: Nathalie, 45, HR Manager in Bordeaux

Nathalie is a mother of two who is very active in local community associations. She opened an OnlyOne account to be consistent with her ecological values.

"I've always been sensitive to the environment, but I had never thought that my bank could be a lever for action. When I read an article about the financing of fossil fuels by traditional banks, I immediately looked for an alternative. OnlyOne convinced me with its transparency: I know exactly where my money goes, and it's a relief. La Place Impact is brilliant — I subscribed to the Goodvest life insurance via the platform and invested in trees with EcoTree. What I also appreciate is the redistribution of commissions via the Ones: every month, I choose to support a local forest protection association. My only regret is the absence of a joint account. With my husband, we would have liked to manage our shared expenses on a joint OnlyOne account. I hope this feature will arrive with the La Nef acquisition."

Nathalie uses savings vaults to set aside money for family vacations and her children's education. When she had a question about a transfer that took longer than expected, she contacted customer service via the chat in the OnlyOne application and received a clear explanation within minutes. She confirms that even without a OnlyOne tel available, the chat support is of good quality.

10. Expansion and Future Outlook

OnlyOne's future is now being written under the umbrella of La Nef, the ethical cooperative bank that acquired its assets in November 2025. This acquisition marks a major strategic turning point, both for OnlyOne and for the green banking ecosystem in France.

The Acquisition by La Nef and the Creation of Nef Lab

La Nef, founded in 1988, is a French financial cooperative and pioneer of ethical finance in Europe. With over 30 years of experience in financing projects with positive social and environmental impact, La Nef has expertise and credibility that few market players can claim. The acquisition of OnlyOne's assets is part of a clear strategy: accelerate La Nef's digital transformation to offer a complete ethical banking offering, combining cooperative strength and digital modernity.

The Nef Lab structure, created for this acquisition, has the mission of developing La Nef's digital services by leveraging OnlyOne's technological infrastructure and application expertise. This synergy is promising: La Nef brings its full banking license, its network of 40,000 members and its cooperative philosophy, while OnlyOne brings its mobile application, its carbon impact measurement tools and its digital UX expertise.

Development of New Features

Several development areas are being considered for the months and years ahead:

• Interest-bearing savings: one of the most frequently cited gaps by current customers. With La Nef's full banking license, it becomes possible to offer interest-bearing savings accounts and ethical investment products directly integrated into the application, without going through external partners
• Joint account: a highly requested feature, already offered by Helios, which could be developed as part of Nef Lab. An ecological joint account would allow couples and roommates to manage their shared expenses while contributing to environmental projects
• Complete professional offer: the development of the OnlyOne business account and OnlyOne professional account could be relaunched, this time with the support of La Nef, which already has expertise in financing the social and solidarity economy. OnlyOne micro-entrepreneurs and OnlyOne auto-entrepreneurs could finally have a truly ethical professional banking solution
• International transfers: OnlyOne international transfers outside the SEPA zone are a highly anticipated service, requiring specific partnerships but which would be a major asset for customers who travel or have ties abroad
• Responsible credit: La Nef is known for its loans to ecological and solidarity projects. Integrating responsible credit solutions into the OnlyOne application would be a major advancement, allowing customers to finance green projects (energy renovation, electric vehicle, etc.) directly from their app
• Eco-coach improvements: enrichment of the carbon footprint calculation algorithm with more precise data, sector comparisons and eco-responsible purchase recommendations based on artificial intelligence

European Expansion

Before its restructuring, OnlyOne had European expansion ambitions, notably thanks to the 35 million euro commitment from GEM. With La Nef as a cooperative actor rooted in France, international expansion will likely take a different form. Rather than rapid growth across Europe, we can expect a strengthening of the position in the French market, with a possible expansion to other French-speaking countries (Belgium, Switzerland, Luxembourg) at a later stage.

La Nef could also develop partnerships with other European cooperative banks (such as GLS Bank in Germany or Triodos Bank in the Netherlands) to create a network of interoperable ethical banking services across the continent.

The Future of Green Banks in France

The green neobank market in France is still young but expanding rapidly. Several trends are emerging for the coming years:

• Market consolidation: the acquisition of OnlyOne by La Nef illustrates a consolidation trend. Smaller neobanks that struggle to achieve profitability will gradually be absorbed by stronger players. This consolidation should benefit consumers, who will enjoy more complete and reliable services
• Strengthened regulation: the European Union is working on new sustainable finance regulations (green taxonomy, SFDR, CSRD). These regulations should favor genuinely committed players like OnlyOne/La Nef and penalize greenwashing
• Increased competition from traditional banks: faced with the rise of green neobanks, major French banks are developing their own "green" offers. However, their credibility remains limited as long as they continue to heavily finance fossil fuel industries
• Technological innovation: artificial intelligence, blockchain and open data (open banking) will open new possibilities for measuring and reducing the environmental impact of financial transactions

In conclusion, the OnlyOne story is far from over. The acquisition by La Nef opens a promising new chapter, combining the digital agility of a fintech with the strength of a historic cooperative bank. To follow developments and new services, feel free to regularly check the onlyonecard.eu website or contact customer service through the OnlyOne application.

OnlyOne and Responsible Finance: Understanding the Ecosystem

To fully understand OnlyOne's value proposition, it is essential to place this neobank in the broader context of responsible finance in France. The French banking industry is one of the most concentrated in Europe, with four major banks (BNP Paribas, Société Générale, Crédit Agricole and BPCE) holding the majority of household deposits. According to reports from Oxfam and Friends of the Earth, these banks have provided over 350 billion euros in financing to fossil fuel industries between 2016 and 2023, making France the leading European financier of coal, oil and gas.

Faced with this reality, a growing number of French people are seeking alternatives. According to a 2023 IFOP survey, over 60% of French people say they are ready to change banks if theirs financed activities harmful to the environment. It is in this context that players like OnlyOne, Helios and Green-Got have emerged, offering a concrete and accessible alternative to traditional banking.

OnlyOne stands out in this ecosystem through its integrated approach. Rather than simply promising not to finance polluting industries, OnlyOne goes further by offering a set of tools that enable customers to measure, understand and reduce their own environmental impact. The eco-coach, the Ones, La Place Impact and partnerships with players like EcoTree and Goodvest form a complete ecosystem that makes every customer an actor in the ecological transition, not just a passive spectator.

This approach has won over an increasingly broad audience, extending beyond convinced environmentalists to reach "conscious" consumers who want to align their financial practices with their values without sacrificing convenience and service quality. For these customers, the question of how to open an OnlyOne account is often the first step in a broader journey toward more responsible consumption.

OnlyOne's Business Model

Understanding OnlyOne's business model helps better grasp the sustainability of its commitments. The neobank derives its revenue from three main sources:

• Monthly subscriptions: at €6/month (or €3/month for youth), this is the main source of recurring revenue. This amount covers operational costs (technology, customer support, compliance) while maintaining a margin for investment in developing new services
• Incidental fees: additional withdrawals, direct debit rejections, card blocks, etc. These fees remain moderate and represent only a minor portion of revenue
• Partnerships: La Place Impact generates commissions when customers subscribe to savings, investment or insurance products offered by OnlyOne's selected partners. It is a win-win model: the customer accesses ethical services, the partner gains a new customer, and OnlyOne earns a commission for the referral

This business model differs from that of traditional banks, which derive a significant portion of their revenue from overdraft interest, overdraft fees and speculative investments. By eliminating authorized overdrafts and redistributing 100% of interbank commissions to partner associations, OnlyOne chooses transparency and alignment with its customers' interests, even if it means lower margins in the short term.

OnlyOne's Measurable Impact

One of the most convincing aspects of OnlyOne's approach is the measurability of its impact. Unlike many players who content themselves with vague promises, OnlyOne regularly communicates concrete results:

• Number of trees planted thanks to commissions redistributed to EcoTree
• Area of protected forests in metropolitan France
• Beehives installed to protect biodiversity
• Tons of CO2 avoided thanks to behavior changes guided by the eco-coach
• Amounts invested in positive-impact projects via La Place Impact

This impact transparency is verified by independent audits and by OnlyOne's ethics committee, which certifies the compliance of partner projects and associations with the neobank's environmental mission. For customers who wish to verify this information, impact reports are regularly published and accessible from the application. If you have questions about OnlyOne's impact or the projects financed, do not hesitate to contact OnlyOne via the chat in the OnlyOne application.

OnlyOne's Strategic Partnerships

OnlyOne has developed a network of carefully selected partnerships to strengthen its offering and impact:

• Société Générale: banking partner for deposit guarantees and Mastercard issuance
• EcoTree: sustainable forest management, tree planting and biodiversity protection in France
• Goodvest: Paris Agreement-aligned life insurance for responsible savings
• ISIC: international student card program for the dedicated student offer
• ADEME: database used for carbon footprint calculation in the eco-coach
• ZEI (Zero Eco Impact): platform listing companies committed to the environment
• UNITLIFE (UN): United Nations fund, partner for social impact
• La Nef: ethical cooperative bank, acquirer of OnlyOne's assets since November 2025

These partnerships form a solid ecosystem that strengthens OnlyOne's credibility and offering quality. Each partner is selected according to strict environmental and social commitment criteria, validated by the neobank's ethics committee.

OnlyOne as a Mission-Driven Company

OnlyOne adopted the status of a mission-driven company (société à mission), a French legal framework created by the 2019 PACTE law. This status means the company includes a purpose and social and environmental objectives in its bylaws, which are verified by an independent third-party body. This is not a mere marketing commitment: it is a legal obligation that exposes the company to sanctions in case of non-compliance with its commitments.

As a mission-driven company, OnlyOne is regularly audited to verify the alignment between its activities and its stated mission. This institutional transparency reassures customers who fear greenwashing and seek a genuinely committed player. To consult mission reports and audit results, visit onlyonecard.eu or request information via the chat in the OnlyOne application.

Frequently Asked Questions About OnlyOne

To complete this guide, here are answers to the most frequently asked questions about OnlyOne.

How do I contact OnlyOne by phone?

There is no public OnlyOne phone number. OnlyOne is a 100% digital OnlyOne neobank whose customer support is exclusively through the integrated chat in the OnlyOne application and by email. If you are looking for the OnlyOne phone, the OnlyOne tel, the OnlyOne number or the OnlyOne phone number, the answer is the same: contact OnlyOne via the application.

Is there an OnlyOne emergency number?

No, there is no OnlyOne emergency number or OnlyOne emergency tel. In case of emergency (loss, theft, fraud), you can block your card instantly from the application, 24/7, without contacting an advisor. For situations requiring urgent human intervention, use the application chat during opening hours.

Does OnlyOne offer a professional phone number?

No, there is no OnlyOne professional number or OnlyOne pro tel. The OnlyOne business phone does not exist either. Whether you are an individual or a professional, the contact channel remains the mobile application.

How do I open an OnlyOne account?

For how to open an OnlyOne account, it is very simple: download the application from the App Store or Google Play Store, enter your personal information, photograph your ID, take a verification selfie, choose your PIN code and fund your account by transfer (minimum €10). The process takes less than 10 minutes and you can use your virtual card immediately.

How do I close an OnlyOne account?

To close an OnlyOne account, you must contact customer service via the application chat and express your wish to close your account. Make sure beforehand that your balance is zero or positive, and that all automatic direct debits have been transferred to another bank account. Customer service will guide you through the closure process.

Is OnlyOne a real bank?

OnlyOne is a payment institution registered with the ACPR (REGAFI number 85585). Technically, it is not a "bank" in the strict sense (it does not hold a credit institution license), but a payment institution offering common banking services (account, card, transfers). The OnlyOne online bank is therefore more precisely an OnlyOne neobank. However, your funds are guaranteed by Société Générale up to 100,000 euros.

Does OnlyOne offer a free card?

A free OnlyOne card does not exist as such: the Mastercard is included in the monthly subscription (€6/month for the standard account). However, there are no additional fees for the first physical card or the first virtual card. Card delivery to your home is also free. For students, the ISIC plan at €36/year (€3/month) represents excellent value for money.

Are payments abroad free?

Yes, OnlyOne charges no foreign fees for card payments: you can pay in any currency worldwide without surcharges. However, ATM withdrawals are charged: 1.5% in Europe outside the euro zone and 2.5% internationally. Free OnlyOne withdrawals are limited to 2 per month in the euro zone.

Does OnlyOne offer instant transfers?

OnlyOne instant transfers are available free of charge, but only between OnlyOne accounts. Standard SEPA transfers to other banks are processed within the standard timeframe of 1 to 2 business days. The OnlyOne transfer time may vary depending on public holidays and weekends.

What should I do in case of lost or stolen card?

In case of OnlyOne card loss or OnlyOne card theft, the first thing to do is block your OnlyOne card immediately from the application. The lost OnlyOne card reporting procedure is instantaneous and available 24/7 from the card management menu in the app. For a phone card block with OnlyOne, remember there is no dedicated number: everything is done through the OnlyOne application. Card block fees are €12, and card renewal will be charged €15 (before expiry) or €10 (at expiry).

How do I reset my PIN code?

If you have forgotten your OnlyOne PIN code, you can reset your PIN from your card settings in the application. The procedure requires identity verification (biometrics or security code) for security reasons. If you encounter difficulties, customer service via the application chat can assist you.

Is OnlyOne secure?

Yes, OnlyOne account security relies on several layers of protection: OnlyOne two-factor authentication (2FA) for all sensitive operations, TLS 1.3 and AES-256 encryption, GDPR and PSD2 compliance, ACPR registration and funds guaranteed by Société Générale. The real-time fraud detection system analyzes each transaction to detect anomalies.

Tips for Getting the Most Out of OnlyOne

To get the best out of your OnlyOne account, here are some practical tips based on user experience and our own analysis of the offering.

Optimize Your Withdrawals

With only 2 free withdrawals per month in the euro zone, it is important to plan your cash needs. Prioritize card payments (free and unlimited) or mobile payments via OnlyOne Apple Pay or OnlyOne Google Pay to limit ATM withdrawals. If you regularly need cash, consider making two larger withdrawals (up to €500 per withdrawal) rather than many small ones. Each free OnlyOne withdrawal beyond the first two costs €1.50, so it is better to plan ahead.

Maximize the Eco-Coach

The eco-coach is one of OnlyOne's most powerful tools, but it is even more useful if you aggregate all your bank accounts in the application. By connecting your accounts from other banks, the eco-coach can calculate your overall carbon footprint, not just the one linked to your OnlyOne spending. This is a particularly useful feature if you use OnlyOne as a secondary account, as it allows you to measure the carbon impact of all your financial transactions.

Take Advantage of Automatic Round-Ups

Automatic rounding to the nearest euro is a painless way to save. For an average user making 40 to 50 card transactions per month, this represents approximately 20 to 25 euros in automatic monthly savings, or 240 to 300 euros per year. It is little per transaction, but the cumulative total over a year is significant. Activate this feature as soon as you open your account to start building an emergency fund effortlessly.

Use Vaults Wisely

OnlyOne's two free vaults are sufficient for most users. Our recommendation: create a "Emergency Savings" vault for automatic round-ups, and a "Projects" vault for manual savings. If you need more vaults, the additional cost of €0.20 per month per vault remains very reasonable. Consider naming your vaults with motivating titles ("Japan Trip 2027", "Electric Bike", etc.) to maintain your savings motivation.

Maximize Account Security

Even though OnlyOne account security is already robust by default, a few best practices further strengthen your protection. Enable biometric OnlyOne two-factor authentication (fingerprint or facial recognition) rather than PIN code alone. Activate push notifications for each transaction to be immediately alerted in case of suspicious activity. And before traveling, consider notifying customer service via the chat in the OnlyOne application to prevent anti-fraud systems from blocking your payments in an unusual country.

Prepare for a Trip with OnlyOne

OnlyOne is an interesting travel companion thanks to its fee-free foreign payments worldwide. However, withdrawals are charged 2.5% outside the euro zone. To optimize your usage while traveling, prioritize card or mobile payments, withdraw larger amounts when you need cash (to minimize the number of charged withdrawals), and keep your virtual card for online purchases during the trip. Before leaving, check that your PIN code works and that your limits are sufficient for your needs. If necessary, you can request a temporary limit increase via chat.

In Case of a Problem with a Merchant

If you notice an unauthorized charge or a problem with a merchant (double charge, incorrect amount, product not received), you can initiate a dispute procedure from the OnlyOne application. Customer service will guide you through the Mastercard chargeback process. Keep all supporting documents (order emails, invoices, correspondence with the merchant) as they will be needed to support your claim. For the OnlyOne complaints service, prefer email for formal requests, and chat for quick questions.

Practical Guide: All Common Procedures on OnlyOne

Here is a summary of the most common procedures and how to perform them via the OnlyOne application.

Modify Your OnlyOne RIB

To modify your OnlyOne RIB, note that you cannot modify your RIB as such (it is assigned to your account). However, you can download your OnlyOne RIB in PDF format from the "My Account" section of the application to provide it to your employer, CAF or any organization that needs your banking details.

Increase Your Limits

To increase your OnlyOne limits, contact customer service via the application chat. Depending on your profile and account history, a temporary or permanent increase of your payment and withdrawal limits may be granted. The standard OnlyOne payment limit is €5,000 per month and the OnlyOne withdrawal limit is €2,000 per month.

Access Your Customer Area

The OnlyOne customer area is exclusively accessible via the mobile application. There is no separate web interface. From your customer area, you can view your transactions, manage your card, make transfers, access La Place Impact, use the eco-coach and contact customer service.

Use Apple Pay and Google Pay

OnlyOne Apple Pay and OnlyOne Google Pay are available and allow contactless payment with your smartphone, even without your physical card. To activate these services, go to your card settings in the OnlyOne application and follow the instructions to add your card to your Apple or Google wallet.

Conclusion

OnlyOne represents a truly innovative approach to everyday banking. By combining a complete banking service with a sincere environmental commitment and concrete impact measurement tools, this OnlyOne neobank has managed to stand out in an increasingly competitive market. The acquisition by La Nef opens promising prospects for the future, with the possibility of developing even more complete services while preserving the founding values.

If you are looking to contact OnlyOne by phone, remember: there is no OnlyOne phone number. All contact goes through the OnlyOne application, whether via the online chat during business hours or by email for less urgent requests. This is a model common to all modern neobanks that enables competitive pricing while maintaining quality service.

Whether you are a student, young professional, parent concerned about the future of the planet or simply curious to discover an alternative to traditional banks, OnlyOne deserves your attention. With its transparent pricing starting from €3 per month, its exclusive eco-coach, its La Place Impact for responsible investing and its French IBAN, OnlyOne checks many boxes for anyone wishing to give meaning to their money.

To get started, simply download the OnlyOne application from the App Store or Google Play Store, and open your account in a few minutes. If you have any questions, do not hesitate to use the integrated chat in the OnlyOne application to speak with an OnlyOne advisor — a real human, available and competent, ready to support you in your transition to a greener bank.

Article updated in April 2026. The pricing information and features described are based on data available at the time of writing. For the most recent information, visit the official website onlyonecard.eu or contact customer service via the OnlyOne application.

Customer support and contact channels for Contact OnlyOne: Phone, Email, Chat and All Contact Details for the Green Neobank

When searching for Contact OnlyOne: Phone, Email, Chat and All Contact Details for the Green Neobank's contact details, the fastest way is usually to visit their official website or check the mobile app. Whether the request concerns account access, card management, transfers, fees, security settings or a complaint, the support team can guide you through the process.

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Security and data protection at Contact OnlyOne: Phone, Email, Chat and All Contact Details for the Green Neobank

The security of your personal and financial data is a top priority for Contact OnlyOne: Phone, Email, Chat and All Contact Details for the Green Neobank.

Enhanced authentication: Contact OnlyOne: Phone, Email, Chat and All Contact Details for the Green Neobank uses two-factor authentication (2FA).

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