Someone in our group needs to be oncall. How is cellphone signal there?

There is no cellphone coverage, or very spotty at best. That is with Verizon.

Agree. I've been all over the park with my kids. Have had emergencies and no cell service. Unless you can make it to the top of ridges.

None. Up on tops of high ridges youll get a good signal, but a lot of the park trails are in the lowlands & canyons and there is no cell tower signal.

Most places get no signal

Don't try it