The G20 in Cannes (France) was recently saved by a Lebanese restaurant owner who found a secret file (detailing the fifth floor of the Carlton hotel where Obama was staying, escape routes, staff appointments, schedules...) forgotten by a FBI agent who had come to buy a sandwich.
The owner contacted the FBI (in the US) with his cell phone and read the file's first page to an incredulous phone operator who told him "Don't move - we're coming" and then hung up without waiting for an address. Five minutes later, two agents entered the restaurant and took the file.
Yes, they had tracked the call to the restaurant owner's cell phone - in France, thus outside the FBI's jurisdiction. Did they have a temporary authorisation from the French police force? Or did they simply ask their staff "ok you losers, who lost his file? A restaurant owner found it." "Oh shit, that's me!". This article hints at the former.
[citation][nom]davidgermain[/nom]dont most have location services turned on by default so all this clever stuff with tech and code and hacks, just friend them on facebook. oh look there you are.....[/citation]
Facebook is for tools.
On a lighter note, the cell companies have been tracking you for years. It's a relief to know that the corporations and government are still years ahead of the underground hacker community when it comes to cellular tracking.
10 blocks is 1 mile, so one might locate a phone within 3.14 square miles. That's not very good in a high density urban setting, where one can easily hide in the crowd. Unless they're looking for a vehicle to go with that phone, the chances of finding the user aren't all that good.