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KDDI Corporation is a Japanese telecommunications operator formed in October 2000 through the merger of DDI, KDD and IDO. The company provides mobile cellular, ISP network and solution services, as well as long-distance and international voice and data communications services. KDDI launched 3G networks using CDMA2000 1x technology on April 1st, 2002. On December 2006, KDDI became the first carrier to provide an EV-DO Rev. A service at a data rate of 3.1Mbit/s on downlink and 1.8Mbit/s on uplink. It is Japan's second-largest cellular operator (after DoCoMo) with an increasing 20% market share.