|Type||Public (TYO: 9433)|
|Founded||June 1, 1984|
|Headquarters||Chiyoda, Tokyo, Japan|
|Key people||Takashi Tanaka, CEO|
|Products||Fixed line and mobile telephony, Internet services, digital television|
|Revenue||US$ 41.30 billion (2012)|
|Net income||US$ 3.1 billion (2012)|
|Subsidiaries||KDDI R&D Labs
KDDI Network & Solutions
Kokusai Cable Ship
Okinawa Cellular Telephone
KDDI Corporation (KDDI株式会社 KDDI Kabushiki Gaisha ) (TYO: 9433) is a Japanese telecommunications operator formed in October 2000 through the merger of DDI Corp., KDD Corp., and IDO Corp. It has its headquarters in the Garden Air Tower in Iidabashi, Chiyoda, Tokyo.
KDDI provides mobile cellular services using the "au by KDDI" brand. ISP network and solution services are provided under the au one net brand, while "au Hikari" is the name under which long-distance and international voice and data communications services and Fiber to the Home (FTTH) services are marketed. ADSL broadband services carry the brand name "ADSL One", and IP telephony over copper is branded as "Metal Plus".
On November 28, 2003, au by KDDI launched EV-DO Rev 0 service in the "CDMA 1X WIN" brand, and revolutionized Japan's mobile telecommunication industry by introducing fixed rate data subscription plans at a data rate of 2.4 Mbit/s.
On December, 2006, au by KDDI became the first carrier to provide an EV-DO Rev A service at a data rate of 3.1Mbit/s (downlink), 1.8Mbit/s (uplink).
au by KDDI has been very successful with its EZ wireless data services, EZweb, EZweb@mail, EZappli, EZchakuuta, ezmovie, and EZnaviwalk (GPS), using the advanced WAP technology. It supports both Java ME and BREW application environments.
In November 2004 au by KDDI introduced the music include ringtone download service Chaku Uta Full (music ringtone full), for download of full length songs to mobile phones. Within six months from introduction, on June 15, 2005, customers had downloaded 10 million full length Chaku Uta Full songs.
As of end of June 2005, au by KDDI has 20,122,700 customers, among which 18,723,200 (93%) are 3G CDMA2000 subscribers. It is Japan's second-largest cellular operator with an increasing 20.0% market share.
Recently, KDDI announced that it will collaborate with the Taiwanese manufacturer HTC Corp. to sell the mobile phone HTC J in Japan starting May 2012. The HTC J mobile phone will feature the Android 4.0 operating system. 
TU-KA (TU-KA by KDDI), a subsidiary company of KDDI, was a 2G PDC cellular operator in three metropolitan areas (Tokyo, Nagoya, and Osaka), which did not apply a 3G license. TU-KA was best known for having singer Ayumi Hamasaki to appear in their commercials. TU-KA was closed on March 31, 2008.
See also 
References and footnotes 
- "2012 Form 10-K, KDDI". Forbes.
- Merger of DDI, KDD and IDO
- "Corporate Data." KDDI. Retrieved on February 21, 2010.
- "HTC and KDDI to sell HTC J". BrightWire.
|Wikimedia Commons has media related to: KDDI|
- (Japanese) KDDI CORPORATION
- (English) KDDI CORPORATION
- (English) Global - KDDI CORPORATION
- KDDI au