The state park we're in right now has just about the same signal strength on both AT&T and Verizon from a tower about a 1/2 mile away. I understand T-Mobile is good here as well, but not Sprint. The previous national park we were at had good Verizon service, but weak AT&T with no T-Mobile or Sprint. The state park before that had good AT&T service, weak Verizon service, and no T-Mobile or Sprint. The bottom line for us is that Verizon and AT&T have kept us online everywhere we've been so far over the past few years.