My Verizon worked in Estes Park, but not at Moraine Park Campground. Not sure about Sprint, but I bet it will.
No problems with my Cingular/AT&T service, but only around town, not in the park.
We were in Estes this weekend and our guest had Sprint. She was able to get service in Estes Park and at either end of RMNP (entrance areas). Up in the park, I don't think anyone can get service.
Sprint is working pretty well every where we've been in Estes. I'm not counting on it when we go up into the park today.
My Sprint phone (Motorola Q) worked everywhere in Estes Park.
And, believe it or not, my phone even rang at the Alpine Visitors center at the top of the park.
I just came back from a trip last week.
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