Earlier quoted context omitted.
> I am terrified about giving smartphones to my kids. Hey smartphone makers, if you're listening: Let me set an alternate PIN that unlocks the phone in a limited access mode, or "kid mode." Only pre-approved apps are available. Only pre-approved contacts can be called/texted. In-game purchases require the more secure PIN. Maybe when the phone is in this mode I can track its location easily, and make it emit a noise.…
I‘m pretty sure Apple won‘t do that, because they want you to buy your kids their own iPhone. Why doesn‘t the iPad have this sort of multi-user mode? An iPad is the perfect device for sharing. But no, if you don‘t want your kids to read your emails, you need to buy them their own iPad.
Once upon a time, kids went to school without phones, so it is possible...