You need to gauge their maturity - and also tell them that this is a TETHERING DEVICE - you will know where they are at all times, and you will see all their communications. If they shut off the phone at various times of the day, you will take it from them (and I know that schools often will say a phone MUST be off - you will have to figure that part out . . ) You need a family account where YOU have the master app, and can control all parameters. If you even SUSPECT that they are doing anything with that phone that is inappropriate, then they lose it for a period of time. Older kids that refuse to hand it over ( and that is ANOTHER issue . . parenting) will have their service cut off - no data, and phone CAN be disabled remotely by you. All photos go to iCloud where you can see them. If as the parent, YOU do not posses the skill to do all of the above, then expect you kids to learn how to do all kinds of things behind your back. I say this a a former teacher of over 25 years - and I returned a few years ago, and it is WORSE now - my adult (39) son and his wife are both teachers, and must be very vigilant. But as the parent - it is YOUR JOB to see everything they do. Once you learn how, takes less than a minute a day to check. Less time them finding a bail bondsman to get them out of jail . . .