Someone recently told me this anecdote:

I overheard on the train home two middle aged ladies talking about their kids mobilephones.

One was saying how they dragged their teen and their mobile phone to the iphone store so they could setup the location tracker and "quiet mode" (parent phone can completly disable the teens phone), and how their child was upset but they are glad it was done.

The other lady was asking how she to can do the same.