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AT&T Mobility, operating in the United States of America (North America & Caribbean), is one of the largest mobile network operators in the country, providing cellular services to millions of subscribers. Recognized by its Mobile Country Code (MCC) of 311 and Mobile Network Code (MNC) of 190, AT&T offers a wide variety of services from basic voice and text to advanced 5G data connectivity. As a major player in the US mobile market, AT&T competes directly with Verizon and T-Mobile, constantly striving to innovate in coverage, speed, and customer satisfaction. AT&T's network infrastructure spans across the US, offering varying levels of coverage depending on location, with dense urban areas and major highways typically enjoying the best signal strength. The company has invested heavily in its 4G LTE and 5G networks, aiming to provide competitive speeds and reliable connectivity. Compared to some smaller regional carriers, AT&T boasts a more robust nationwide presence, making it a popular choice for users who travel frequently or reside in areas with limited cellular options. The MCC and MNC are crucial identifiers in the global mobile network ecosystem, highlighting AT&T's specific operational footprint within the United States.