T-Mobile is the last of the four major carriers to rollout 4G LTE wireless service and according to a study by RootMetrics, the company is off to a solid start, although so far it only offers the speedy connections in seven cities.\n\n\n\tRootMetrics, a company that tests wireless connection speeds, looked at performance in just one of those markets\u00a0 -- Las Vegas -- but the results bode well for service in other areas. That\u2019s not to say T-Mobile blew the competition out of the water. It didn\u2019t. AT&T continues to offer the fastest 4G LTE service across major markets, including Las Vegas, and Verizon was marginally faster in the most recent round of testing.\n\n\n\tBut now that T-Mobile has bulked up by merging with MetroPCS, its service is likely to improve over the next few years, making it worthy of consideration when you\u2019re shopping for a wireless carrier. T-Mobile now has 4G LTE service in Baltimore, Houston, Kansas City, Las Vegas, Phoenix, San Jose, and Washington D.C., with more markets in the planning stages.\n\n\n\tThe most obvious place to start is speed. As you can see from the chart below, AT&T was much faster than either Verizon or T-Mobile in Las Vegas. But the difference between Verizon and T-Mobile wasn\u2019t very significant. (Sprint doesn\u2019t offer LTE service in America\u2019s gambling capital.)\n\n\n\tAnother important metric is what RootMetrics calls "likelihood of LTE." Simply put, that means what are the chances you\u2019ll connect with the service at LTE speeds. By this measure, T-Mobile lagged well behind its larger rivals. Chances of downloading data on T-Mobile\u2019s network were 65.8 percent, compared with 99 percent on AT&T\u2019s network, and 99.6 percent on Verizon's.\n\n\n\tEven so, RootMetrics calls T-Mobile\u2019s performance "a great opening act" and notes that in tests of Sprint\u2019s network, downloads hit LTE speed just 50.2 percent of the time.\n\n\n\tT-Mobile is trying hard to catch its three larger rivals. Although I think T-Mobile\u2019s claim that it offers "no contract service" is full of gotchas, its prices are certainly competitive. MetroPCS customers will be moved over to T-Mobile's network by 2015. Once that's done, the spectrum previously devoted to MetroPCS' CDMA network will be repurposed to help build out T-Mobile's LTE network.