Comment by red369

Cider9986 answered for Android, so I'll throw out a suggestion for iPhone.

Assistive Access on iPhone might be an option for people looking for something drastic. Turning it on is simple, but it's pretty brutal and a bit crude in some ways even compared to a feature phone. Your mileage will vary! It's something I often suggest, and never quite recommend.

https://support.apple.com/en-sg/guide/assistive-access-iphon...

You pick the apps you want access to, and the permissions each should have, set a password, and then when you turn Assistive Access on, the phone reboots into a very limited mode. You can have every app you want, but when I've played with it, I've still found it felt too limited for daily use. Maybe I wouldn't find that if I was at the point of buying a feature phone. I can't remember what frustrated me, except that I remember being pleasantly surprised by how much worked, and frustrated by some basic things.

As an example, I was impressed that I could turn on and off a VPN through an app, even though I couldn't see the status of it outside the app. On the other hand, the location permissions felt buggy, and the locations permission changes in Assisted Access mode seemed to mess with the settings in the normal mode too.