AT&T FamilyMap uses a number of techniques to determine a phone's location. AT&T phones that have Assisted GPS (A-GPS) return the most accurate locations when they have a clear line of sight to GPS satellites. For phones where A-GPS is not available, FamilyMap uses cell tower information to provide the most accurate location possible, which is usually within a few hundred yards to a few miles of the phone's actual location. This includes non A-GPS phones, as well as A-GPS phones that are not in a clear line of sight to GPS satellites.
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