For once, we here in the 'States are technologically ahead of the guys in Korea: South Korean police are only now proposing to have the tech wired up so people can be tracked by cell phone and satellite. What's totally suspect is the reasoning:

The new proposal is submitted in a bid to combat the increasing incidence of kidnapping and other crimes against women and children, the police said.

Why suspect? Because:

...the system does not work well indoors, where satellite signals are blocked.

I don't think this is going to be a tough technology to beat. Tip to kidnappers: When you nab someone a) take their phone away or b) avoid leaving them outside in the yard.

via textually