We have been US Cellular customers for many years. Coverage has always been excellent no matter where we've traveled. But the reality is that no matter who you use there isn't always a tower close enough to get service, or things interfere, like hills and mountains.
In Yellowstone I was surprised to receive a call while on a back country trail. But there where a few spots in the park where coverage was just non-existent. Same with Yosemite. Good service in the valley, not so much on other park roads and trails.
