Could you please advice; what would be a very userfriendly and safe Android app to be used by the less tech savvy
to buy some BTC and keep them in their own wallet on their phone?

Friends and family like to buy a bit of BTC too, but exchanges and alike are way too complicated for them.
They just want to click & buy, have secure local storage and be able to sell, no trading functionalities required.

Does anyone know if these kind of "Mobile BTC Wallet for Dummies" exist?