KDDI
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KDDI Corporation (KDDI株式会社, KDDI Kabushiki Gaisha) (TYO: 9433) is a Japanese telecommunications operator. It was established in 2000 through the merger of DDI (第二電電, Daini Denden), KDD (ケイディディ), and IDO (日本移動通信, Nippon Idō Tsūshin). In 2001, it merged with a subsidiary named Au, which was formed through the merger of seven automotive and mobile phone companies from the DDI-Cellular Group. As of 2020, it is the second-largest mobile telecommunications provider in Japan in terms of the number of contracts, following NTT Docomo.
