A-GPS is extensively used with GPS-capable cellular phones, as its development was accelerated by the U.S. FCC 's 911 requirement to make cell phone location data available to emergency call dispatchers. It can supply orbital data or almanac for the GPS satellites to the GPS receiver, enabling the GPS receiver to lock to the satellites more rapidly in some cases. 2  The network can provide precise time. 3  Mobile Station Assisted (MSA): Calculation of position by the server using information from the GPS receiver.