OnlyOne

About OnlyOne

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