“which has a GPS tracker for parents to use to keep track of the kids.”
No, it keeps track of where the phone is. The phone could be in a movie multiplex at the mall, while the kid is an hour away and still moving.
vaid point.
of course it is NOT illegal to lojack your kids...
(there is another company that has a wrist watch that lojacks kids, the watch automatically sends a tamper alarm signal.)