September 15, 2010 - A Texas-based company called Guardian Location Systems LLC sued AT&T, Sprint Nextel and AT&T for patent infringement, claiming that they infringed its patent on cell phone location tracking.
Guardian claims that their patent is infringed by AT&T's FamilyMap plan, Sprint Nextel's Sprint Family Locator and Verizon's Family Locator plan. The services offered by the three major wireless providers infringe its patent, Guardian asserts, because they use a location monitoring system to track the phones and a web server to store location data.