I am thinking about planning a trip to Montana to see Yellowstone, and other sights. Does anyone know what kind of cell coverage they have? On every national providers map there are a ton of holes in Montana. I have Sprint and T-Mobile, so I could bring both phones, but I dont want to just know about Sprint and T-Mobile. Some of my friends will prob go and they have the other national providers like Verizon, Cingular and ATT.