It could potentially help to catch people who have commited crimes, but in hindsight police agencies have been able to do such things with help from the phone companies for nearly a decade, ever since cell phones switched to digital signals.
Michael: Jodie, how's my schedule look for today? Jodie: You've got a conference and dinner party at the Japanese Embassy regarding wildlife protection. Michael: Oh, yeah...sorry, but I'll have to cancel that. I'm heading out to save America!