1. Buy pixel

2. Install grapheneOS

3. Do not install google playstore, it's optional

4. Create a non-admin profile for him

5. Done, nothing else can be installed by him

Regarding phone calls, I don't know if that is possible but it would be an interesting feature to implement (a whitelist for calls instead of a blacklist), you can suggest that to the devs, they are very responsive.

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If the phone reboots, you'll need to take a drive over or whatever to unlock the Owner profile for him...

True, didn't think about that. Maybe that forces regular visits, which might be a good thing 😄

This is so helpful and I’ll check it out, thank you so much!