I agree, T-Mobile's coverage has improved pretty impressively over the past year or so. For the best 4G/LTE coverage though, you do need a device that uses the 700Mhz Band 12 frequencies. That's what T-M has mostly been building out rapidly. At our Adirondack cottage, we couldn't even get a sniff of a T-M signal a year ago, but now we're getting a usable T-M 4G/LTE Band 12 signal there even without our powerful MaxAmp booster turned on. Verizon is still the coverage king of course, but I think T-M is getting close to giving AT&T a run for it, and has already passed them in some categories.