T-Mobile USA, operating under MCC 310 and MNC 800, stands as one of the major mobile network operators in the United States, serving customers across North America and the Caribbean. Known for its disruptive "Un-carrier" strategies, T-Mobile has significantly impacted the US mobile market, often challenging the dominance of Verizon and AT&T with innovative plans and aggressive network expansion. Initially founded as VoiceStream Wireless, the company rebranded as T-Mobile and later merged with MetroPCS, further solidifying its position. T-Mobile's network infrastructure utilizes a range of frequencies to provide 4G LTE and 5G services, constantly expanding its coverage to reach both urban centers and more rural areas within the USA. Similar to other carriers like Verizon (MCC 311) and AT&T (MCC 310), T-Mobile leverages a combination of low-band, mid-band, and high-band (mmWave) spectrum to deliver varying levels of speed and coverage. They are currently focused on expanding their 5G footprint making it one of the largest and most performant 5G networks in the country, making it a strong competitor in the North American Mobile Network market.