The 2 biggest carriers in the CONUS are AT&T and Verizon. Sprint comes in a distant third. They both have considerable dead zones throughout the country. AT&T covers for the most part where Verizon doesn't and vice versa...
In my experience travelling throughout Texas, Louisiana, Oklahoma, Arkansas, Tennessee, Colorado, New Mexico, Arizona, Oregon, Nevada, Washington etc.... AT&T has had coverage on my phone, far more often than my Verizon carrying co travellers. However, there are big swaths, particularly in Oregon where Verizon covers that AT&T just won't catch signal...
I should mention, price them up. Verizon is insane on cost. If I had to go with Verizon, I'd likely drop cellular entirely. Just too expensive.
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