LINK quote [Track a phone number here. GSM mobile phone tracking system via the GPS-TRACK satellite network. Based on repeater triangulation, the system tracks mobile phones using GPS and GSM technology. We are not responsible for possible tracking errors that may occur. Approximate margin of error: 10 meters (max.) for mobile phones in Europe and the U.K. - 25 meters (max.) for mobile phones in the U.S.A., South America and Canada. - 50 meters (max.) for mobile phones elsewhere. This system will not work in countries without GSM technology networks].