Some phones only. Or at least that is how it used to be when I had one not too long ago. The boot loader had the be unlocked and some apps like banks or Google pay refused to work at the time (or maybe it was if you had root enabled).

Yeah I was looking into Linux based mobile OS’s and I’ve come to the consensus that hardware selection is very limited.

I was very interested in GrapheneOS but unfortunately it’s for Pixel phones only.