I'm amazingly disappointed in the mobile phone coverage in the US. I was dying to make a call into work today as we were traveling from Maine through New Hampshire and Vermont to New York. I couldn't get a signal the entire 6 hour trip. This never has happened to me in Europe. France, about twice the size of the state of Colorado, has virtually 100% coverage through any one of the four providers. Whether you're in the center of Paris or in some vineyard in Bordeaux you got signal. This goes for any country in Europe. I can almost say that I have never been anywhere in Europe without a signal - even out at sea in Croatia I was making mobile calls at full strength.