Most of the Colorado Plateau will have no connection unless you have a phone with wifi calling and can use a motel's wifi. You see people "war driving" at night to get online.
Areas on the interstates have no signal for some carriers. TMO is putting in Band 12(700)
to help out with that.
Moab, UT used to have signs posted in the motels - "if you can't see the LaSals, you have no cell service" Still very true if offroading or canyoneering. Need satellite. If you are camping in the back of beyond, you need to download all your new books before you go.
I prefer wifi only tablets.
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