For A, you can also disable the ability to download apps. Lock everything behind a difficult to type password. If that’s not enough, ask a friend to set such a

For A, you can also disable the ability to download apps. Lock everything behind a difficult to type password. If that’s not enough, ask a friend to set such a password for you without telling you what it is. For optimal lock-out, ask a few strangers that don’t know each other and that you’re unlikely to ever meet again to each type a part of such a password (warning: this may make it impossible to download security updates or even to restore the phone to factory defaults)