T-Mobile US, Inc., formerly MetroPCS Communications, Inc., is a wireless telecommunications carrier, which offers wireless broadband mobile services primarily in selected metropolitan areas in the United States, including the Atlanta, Boston, Dallas/Fort Worth, Detroit, Las Vegas, Los Angeles, Miami, New York, Orlando/Jacksonville, Philadelphia, Sacramento, San Francisco and Tampa/Sarasota metropolitan areas. As of December 31, 2012, it holds licenses for wireless spectrum suitable for wireless broadband mobile services. In addition, it had roaming agreements with other wireless broadband mobile carriers that allow them to offer its customers service in many areas when they are outside its service area. It provides its services using code division multiple accesses (CDMA) networks using 1xRTT technology and evolution data optimized (EVDO) and fourth generation long term evolution (4G LTE). The Company's flagship brands include T-Mobile and MetroPCS.