People will never give up their phones, unlimited data. In a bad economy, they will give up a couple Chipotles or Cheescake and keep their phone.
And we know that teens do not use good judgement. They will say, of course Dad, I don't text and drive. That is just the way things are. Plus, I say again, the value of finding the kid is worth the price of the app alone. Not big brother, but just in case the kid needs help.
OPMG