Expanded Coverage in New Mexico
T-Mo's network ends in Wagon Wheel (just east of Moriarty). I went through there yesterday...my phone switched to Plateau Wireless, where before coverage used to end. I went as far east as Newkirk (about half-way between Santa Rosa and Tucumcari) and had coverage all the way.
Service on Plateau was generally very good, except I dropped once when being handed off from T-Mo to Plateau (there was also a valley there).
GSM coverage in New Mexico is expanding rapidly. It is pretty good when you can be in an old-Rte. 66 semi-ghost town in the middle of nowhere and still use a cell phone.