au

KDDI Corporation, operating under the brand "au," is a major mobile network operator in Japan, playing a crucial role in the country's telecommunications landscape. Identified by the Mobile Country Code (MCC) 440, which designates Japan, and the Mobile Network Code (MNC) 51, "au" provides a wide range of mobile services to millions of subscribers across the nation. As one of the "big three" mobile carriers in Japan, alongside NTT Docomo and SoftBank, KDDI au competes fiercely in terms of coverage, speed, and innovative service offerings. Known for its extensive network infrastructure and commitment to technological advancement, KDDI au offers 4G LTE and rapidly expanding 5G services, ensuring reliable connectivity for both individual consumers and businesses. Beyond basic connectivity, "au" often bundles its mobile plans with other services, such as internet and entertainment, adding value for its customers. Furthermore, the carrier actively participates in developing and deploying new technologies, contributing to Japan's position as a leader in mobile technology within Asia and the broader Middle East region, even though its primary operations are within Japan itself.