T-Mobile US Inc (NYSE:TMUS) is planning to use spectrum that they acquired from MetroPCS Communications to activated faster LTE services in several cities. One of the first cities to benefit from the increased spectrum is Dallas, Texas. The 10-by-10 LTE service will be pushed into 40 out of the top 50 markets by the end of the year. The company is also working on a service called 20-by-20, which doubles the 20MHz spectrum that is used by LTE networks and will be rolled out next year. The 20-by-20 service works on any LTE capable device.