I made a thread for best European OS for computers and Laptops : OpenSUSE. Now one for smartphones :

Fairphone, the European manufacturer of mobile phones with a reduced environmental impact, has announced a partnership to offer /e/OS, the most "de-Googled" and pro-privacy Android OS, on their latest model Fairphone 3. An interesting move that reminds me of the recent introduction of the Google-free Huawei Mate 30.

A pithy explainer of its "privacy by design ecosystem" -- and the point of "Android without Google" -- further notes: "We have removed many pieces of code that send your personal data to remote servers without your consent. We don't scan your data in your phone or in your cloud space, and we don't track your location a hundred times a day or collect what you're doing with your apps."
premium on the Googley flavor of Android you get on the standard Fairphone 3." The report adds that existing owners of the Fairphone 3 can manually install /e/OS
According to TechCrunch, the e/OS variant of the Firephone 3 ships from May 6, priced at just under 480 euros -- "a 30 euro gratis via an installer on its website.