To find your cellphone with GPS, you must install a third-party GPS locating application such as Find My iPhone, LookOut or Prey when you purchase your device. When you lose your phone, log into your application's website to view the location of your device on a map.
Service providers such as Verizon and AT&T enable customers to view the location of their phones on a map when they register for location services. Verizon users subscribe to Total Mobile Protection while AT&T users subscribe to FamilyMap. Some devices come with built-in features that enable GPS tracking on the manufacturer's website. To locate your cellphone with these services, your device must be GPS-enabled, powered on and in a location where it can receive cellular data.
Third party applications such as LookOut, Avast and Prey enable users to track their GPS-enabled phones when they go missing. To locate your phone with these services, you must install the application beforehand and synchronize your devices in one user account on the application's website. When your phone goes missing, log into your online account and enable tracking. The application discretely turns on the GPS on your phone and runs in the background until it locates your phone. Some applications display the location of the phone on a map that is accurate to 30 feet.