My kid and two friends are going on a 3 week backpacking trip, and all their
phones have a GPS feature. (My son's phone is a Samsung SCH-A950). Assuming
the GPS feature has not been switched to "911 emergency only", and assuming
the phone is in an active zone for the carrier in question, is it possible
for the carrier to ping a phone and get an approximate location? I'm
assuming no input from the phone user, other than the fact that the phone is
turned ON.