That map is basically useless. The blank areas on it are typically inaccessible for vehicle traffic.What part of N AZ? Does this map coincide with your Verizon experience, and does ATT look better? https://map.coveragemap.com/signal-strength
Apparently if you can get any signal at all, a cell booster can make it usable... but never used one myself.
If you are near a town or major highway you will likely have a choice of a couple of different providers. But much depends on the terrain for how good of a signal strength you can get. The terrain can block signals from towers as can the distance and strength of the signal being emitted from a tower. Anytime you are that close to towns in Arizona there is a lot of noise from off road vehicles with weekend camping. Sorry but it is not peaceful paradise camping.
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