And why is that important, since we've managed to survive without that capability for several tens of thousands of years in much worse circumstances than a modern city?
So 100 years ago, a guy kidnapping your daughter (just an example of anything that could only be resolved by you knowing where you daughter was) isn't a serious worry, since that's a 0.01% risk as opposed to the 2% risk your daughter gets sick with whatever and dies.
Now, it's that same 0.01% risk compared to a 0.00003% risk thanks to advancements in modern medicine, so we worry about it much more.
Makes sense at first, but I don't think we are. I see other cultures (including western ones), and even the US at 70s and earlier, that don't do the same "everything" at all.
I think what we are, in some countries, is conditioned by hysterical media and hysterical society, to over-protect our children to the point of social pathology.
Brilliant, but she's 12. There's an astounding difference between "knowing where my daughter is" and "enabling my daughter to call for help (e.g., 911) if she's in an emergency." You don't have to be a helicopter parent and track her location to give her the ability to have a tangible, modern benefit of a phone: the ability to immediately have police or paramedics if she needs them.