Have had all 3 major carriers and Verizon is the one with the least gaps or the BEST total coverage. There are some areas where AT&T did work and no other carrier did, but those holes are rapidly disappearing, especially in south Texas. We still carry an AT&T Trac phone for the possibility of getting into an area where we have no Verizon in south Texas, but have not needed it for over 1½ years now.