There are three things that lead to fast lock times for cell phones. * Ephemeris and almanac data updated via the internet so the receiver doesn't have to wait

There are three things that lead to fast lock times for cell phones. * Ephemeris and almanac data updated via the internet so the receiver doesn't have to wait for either and can immediately know what satellites to listen for and acquire. * Precise clock via NTP so the receiver has a smaller solve space for its internal clock * AGPS gives a very good position fix to further help with the initial clock and position solving