When traveling with my youngest and his buddy, we have both AT&T and Verizon. Most of the time, coverage is the same. In some spots we have service on AT&T and he does not on Verizon. Other places are the exact opposite. In some very rare places, none of us had service. However, even in spots with no service, we have found that a hike up a hill or a short drive can get us to service if needed. I know that in any Texas state park I have not had service in, the rangers could tell me exactly where the closest point was. I like to be able to call my wife and tell her I have arrived safely, etc.