im still a teenager and the only solution there which any normal (eg not a complete and utter momma's boy who thinks sex is a bad word) teenager would accept would be a cell phone

the best form of protection would be good parenting, teaching right from wrong etc... so the teenager/kid doesn't feel he has to lie to his parents, odds are all teenagers lie to their parents about there whereabouts and what they are doing at some point, but we need our own freedom and privacy as well, GPS tracking is unreasonable imo, a teenager should be allowed to go and do what they want (not illegal but see who they want to etc.. )as long as there is a set time to return and a way to contact, i don't think parents should have root access to our whole lives

sorry if the above doesn't make much sense.. but its 10pm and im tired