We should treat phones on kids the same we treat alchohol. "What the fuck, is that a phone? Give me that!" The only other solution involves evaporating our privacy. Fuk 'em kids. I guess they don't get to use phones, we survived, why can't they?
In fact, it is probably better for them to "struggle" and figure out by themselves how to find a way to circumvent it. Make them think instead of having thoughts feed into them.
One small problem is that we used to have landlines to call friends (for chats or homeworks) and those are practically dead