My father is way more tech illiterate and I got him a Samsung, I put the mod 'ultra power saving' where it locks down the phone to 8 preselected app, no app drawer only home screen with the 8 icons, and it's enough for him to make phone call, send SMS and take photo. Everything else he doesn't know how to use and didn't want to learn anyway. Bonus, the phone last for one to two week.
Now I don't know if yours is as bad as my father, in that case I'd suggest Samsung, but my mother on the other hand she can actually use the phone for many things : Spotify, using wireless payment, Waze and so on... It's just that things got to be intuitive enough and she is going to fall every time there is dark pattern and she is going to call me every time something is convoluted.
Because of that Android is even worst, Google UI is horrendous and they are master at dark pattern, at least as good as Microsoft.
Apple is still better but that's a far cry from what it used to be a few years ago.
We are evolving, just not in the right direction.