Through a continuous restructuring process, spin-outs, mergers and acquisitions, and through intensive customer focus and focus on Japan's market alone, KDDI has transformed itself from a former monopoly voice phone operator to one of the world's most successful and most advanced communications companies. KDDI has consistently won market share from it's competitors DoCoMo and Vodafone/SoftBank-Mobile, and is the clear winner in the aftermath of the introduction of number portability in Japan. KDDI is constantly pioneering services and technologies. There are many advanced services which KDDI brings to market several years before competitors DoCoMo and and Vodafone/SoftBank follow, examples are 3.5G high-speed mobile internet, flat-rate data plans, full-song mobile music downloads (Chaku-uta full), GPS and location based services, and many more - which are explained and documented in this report. The present reports outlines the corporate structure of the KDDI group, explains some of the M&A history, and gives a detailed overview of many of the advanced services which have been the platform for KDDI's success. The report also contains detailed statistics (financial data, market share data) documenting KDDI's successes.