Even Verizon does not work.if you have to make a call go into town. 10 min drive, and they do have telephones at the front of the park by the main gate. I believe the visitor center has free Wi-fi. So you can make Wi-Fi telephone calls.
I had no problems with the cell phone
Very weak or non existen cell coverage.
Very weak in some of the northern parts of the park, nonexistant in the rest.
Pretty much non-existent. One of the reasons we like it so much :-
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