au

KDDI Corporation, operating under the "au" brand, is a major mobile network operator in Japan, holding the Mobile Network Code (MNC) 54 under the Mobile Country Code (MCC) 440. As one of the leading telecommunications providers in the country, au competes directly with NTT Docomo and SoftBank, offering a comprehensive suite of mobile services, including voice, data, and multimedia applications to a substantial subscriber base throughout Japan, a nation renowned for its advanced technological infrastructure and keen adoption of new-gen mobile technologies. Covering the islands of Japan in the Asia and Middle East region, KDDI au distinguishes itself through its commitment to innovation and customer experience. The network has been at the forefront of deploying advanced mobile technologies, from early adoption of 3G and LTE to its current rollout of 5G services. Furthermore, au often collaborates with international partners to stay ahead, developing unique handsets, and is popular for its integrated entertainment and content offerings. The company continues to invest heavily in network infrastructure to maintain its position as a key player in Japan's dynamic mobile market.