I spent about 17 years in the wireless industry dating back to 1991. In the area I worked in the wireless industry, it is now owned and operated by Verizon.
Sprint and TMobile are what we referred to as "spider web" networks. They have good coverage in major metropolitan areas and along major highways.
AT&T is better, but still is lacking in buildout of a nationwide network.
Until last March, I traveled most of southern MN and northern IA for an ACDelco warehouse distributor. My employer provided all of it's reps with Verizon phones due to our travels in areas that AT&T, TMobile and Sprint cover poorly. When I would work with factory reps - many of them had the other carriers. It was not unusual for them to need to use my phone to make calls.
My wife travels all over North America for work. She has worked as far north as Dawson Creek, British Columbia and as far south as Tampa, Florida. She too has run into situations where coworkers (who live all over the U.S.) have one of the other carriers and find their phones unusable.
That is not to say that Verizon works everywhere. It doesn't.
But it works better more often than not.
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