Yup, ATT's rural coverage is poor. Admittedly, they're all "poor" but Verizon is better in California, as I quickly discovered when we switched carriers.

It's in constant flux because they're always adding cell towers (I once worked on permitting for a couple dozen proposed Verizon towers in NW California). Contra the added coverage is increased traffic, which can make connecting difficult even within coverage. It takes bandwidth to watch all those videos!
Verizon coverage map

ATT Coverage map

Cheers,

Originally Posted By wandering_daisy
I have taken my cell phone a few times and it was worthless (east side of the Sierra). I could not get anything, yet others could. I was told it was because I had AT&T and they have poor service in rural areas. In this case, does it matter who the carrier is for the "ping" thing? Will a non-AT&T tower pick up my phone? I suspect the reason I do not get service is that AT&T simply does not have an agreement in place with the local carriers. Or that I have a poor plan that limits my roaming capabilities.
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--Rick