Three of the big four operators have plans for major expansions of their LTE networks this summer. Sprint is targeting 120 cities. T-Mobile has promised its infant network would cover 100 million people by mid-year. AT&T is committed to 78 new markets. While the first two have a long way to go, AT&T appears to be almost done. Ma Bell announced on Tuesday that 35 new towns and small cities have received the 4G upgrade, placing its count right at 68. AT&T isn’t just making quick work of its list; it’s adding new markets to it. So when summer comes to a close, it will probably have far more new markets online than its planned 78. In fact, AT&T recently raised its year-end goal from 250 million to 270 million people covered, which puts it within spitting distance of completing its network.