A Verizon Wireless manual explains some of the features of its phones, under the heading "Mobile Entertainment":
Locate your children by their LBS-enabled wireless devices and get real-time updates right on your PC or Verizon Wireless device. And as an extra service, Family Locator with Child Zone® will even alert you by text message when your child's wireless device enters or leaves any area you determine, such as a school or a playground. You'll get the added peace of mind knowing that you're never out of touch with your family.
And your child, if your child has any sense, will get a disposable phone from the 7-Eleven while leaving his or her personal tracking device in a school locker.