COMMENT
My wife and I were debating whether to buy our pre-teen kids smartphones, as recommended by their primary school for safety reasons.
Then one day, we lost track of our daughter on Wynyard Quarter (yes, I had my face buried in my own smartphone at the time of her disappearance).
We found her again a few minutes later after security guards at a neighbouring boat show volunteered to perform a grid search of the wharf (and, helpfully, I was able to show them a photo I had taken of my daughter just a few minutes earlier - see, my smartphone obsession is good for something).
But it was still case-closed. We went out and bought smartphones for our kids the next day.