I'd go with a Pixel phone. Samsung phones are great too but a bit of extra software you probably don't need that takes up space. Any Android phone is 'mostly

I'd go with a Pixel phone. Samsung phones are great too but a bit of extra software you probably don't need that takes up space. Any Android phone is 'mostly open' in the sense you can sideload apps super easily. Google apps are functional. There's some 'truly open' options out there but they're typically expensive for the specs and the included apps are less useful than Google apps.