As of August 3, 2015
Kokusai Denshin Denwa Co., Ltd. (KDD) is established.
First successful TV broadcast reception between Japan and the U.S.A. occurs at the Ibaraki Space Communications Experimental Station.
KDD starts No. 1 Trans Pacific Cable (TPC-1) service.TPC-1 (Trans Pacific Cable 1) was the first submarine cable to link the Kanagawa Prefecture Ninomiya Cable Landing Station and Guam and continue into mainland U.S.A. via Hawaii. It opened on June 19, 1964. Using a coaxial submarine cable, it had a small capacity of only 128 telephone lines and handled communications between Japan and the U.S.A for 26 years until 1990.
|August||KDD joins INTELSAT (International Telecommunications Satellite Organization).|
KDD starts service for Ibaraki Earth Station in Takahagi Ibaraki Prefecture. TV transmission between Japan and the U.S.A. begins.In addition to acting as an earth station for INTELSAT Pacific Ocean satellite transmissions, this station was also used for TV signals via PanAmSat and AsiaSat. It closed on March 16, 2007.
|1969||May||KDD starts service for Yamaguchi Earth Station in Yamaguchi Prefecture. A satellite circuit is established between Japan and Europe.|
|1973||March||KDD starts International Direct Dialing (IDD) service.|
|1977||March||KDD joins International Maritime Satellite Organization (INMARSAT).|
|1984||June||Daini-Denden Planning Company is established.|
Teleway Japan Corporation (TWJ) is established.
As of August 3, 2015
|1985||April||Implementation of Telecommunications Business Law (deregulation of the telecommunications industry)|
DDI CORPORATION (DDI) launches operations.
Tokyo Telecommunication Network Co., Inc. (TTNet) is established in Kanto as a regional telecommunications company.
|October||DDI begins Tokaido Route (Tokyo-Nagoya-Osaka) leased circuit service.|
NIPPON IDOU TSUSHIN CORPORATION is established.
|September||DDI begins Domestic long-distance service along the Tokaido Route (Tokyo-Nagoya-Osaka).|
IDO launches car telephone service using the Hi-Cap analog cellular system.First emergence of a new car phone in the NTT dominated car phone market
KDD starts service for No. 3 Trans Pacific Cable (TPC-3), the first submarine optical cable in the Pacific Ocean.This 13,300 km cable connecting the Chikura Cable Landing Station - Guam - Hawaii - Mainland U.S.A. was the world's longest at the time.
IDO launches Handy Phone Service (a compact lightweight cellular phone).In addition to the traditional shoulder-type phones, a handy type small cellular phone. With its compact body that the user can hold with one hand, usage increased in the business arena.
|July||KANSAI CELLULAR begins TACS system.|
|July||Tu-KA Cellular Tokyo Inc. is established.|
|October||TU-KA Phone Kansai Inc. is established.|
IDO launches TACS-based Service.
|1992||February||TU-KA Cellular Tokai Inc. is established.|
|December||DDI completes national service network.|
|IDO and CELLULAR Group introduce TACS-based nationwide roaming and interconnection.|
|1993||September||DDI is listed in the Second Section of the Tokyo Stock Exchange.|
Mobile phone customer purchase system begins.The system wherein users purchase the mobile phone handsets that phone companies had been renting up until then. It eliminated the need for users to pay expensive deposits, and marked the beginning of popularity among younger users.
|KANSAI CELLULAR launches Personal Digital Cellular (PDC) system.|
IDO launches Personal Digital Cellular (PDC) system.Text input limited to alphabet and katakana, with a monochrome liquid crystal display. The first mobile phone handsets did not have an email function. "Puchi mail" service started the next year in 1997.
|November||PHS enterprise DDI Pocket Telephone Group begins with nine companies.|
|1995||September||DDI is listed in the First Section of the Tokyo Stock Exchange.|
|1997||July||DION Service is launched.|
|1998||December||Kokusai Denshin Denwa Co., Ltd. (KDD) and Teleway Corp. merge to create KDD Corporation.|
IDO and CELLULAR Group complete cdmaOne nationwide seamless network.In addition to superior high-speed data transmission performance, this network is characterized by calls not breaking up and a marked improvement in replicating the natural voice of the speaker. These features linked to an increase in subscribers.
IDO and CELLULAR Group launch Mobile Internet Connection Service EZweb.
|2000||January||The nine companies of the DDI Pocket Telephone Group merge.|
|July||IDO and CELLULAR Group launch "au," a uniform nationwide mobile communications brand.|
As of April, 2018
The seven companies of the CELLULAR Group merge to launch au CORPORATION.
|2001||April||Corporate name is changed to KDDI CORPORATION.|
|May||MYLINE carrier selection service is launched.|
|October||au COPORATION is merged with KDDI CORPORATION.|
Regional telecommunications companies TTNet, Osaka Media Port (OMP), and Chubu Telecommunications Co. (CTC) spin off their business data telecommunications services to launch POWERDCOM, Inc.
GPS mobile is released as the first mobile phone equipped with an "electric compass."Equipping mobile phones with a compass enabled a screen display that acts just like a car navigation displayer to make the map rotate automatically so the direction of movement is always oriented to the top of the screen when displaying a map while on the move.
Third-generation (3G) mobile phone service (CDMA2000 1x) is launched.Previous cdmaOne models had a maximum transmission speed of only 64 kbps. The CDMA2000 1x increased the maximum speed to up to 144 kbps.
"Chaku-uta(R)" music download service is launched.This was the world's first service allowing users to download the original CD sound source to their mobile phone and set it as the ring tone.
|2003||April||TTNet and POWEREDCOM merge under the POWERDCOM name.|
KDDI Hikari Plus (now au Hikari), a suite of optical fiber-based services, is launched.This enabled usage of the internet, phone, and TV all with one optic fiber.
|"EZ NaviWalk" navigation service for pedestrians is launched.|
CDMA 1X WIN, an enhanced 3G mobile phone service based on CDMA2000 1xEV-DO technology, is launched.This introduced the first packet fixed rate system for mobile phones (called "EZ Flat" at the time, and currently known as "Double-Teigaku").
Sales of "INFOBAR," the first model from the au design project, begin.
|2004||October||DDI Pocket Telephone business is transferred to the Carlyle Group and Kyocera.|
|November||"Chaku-uta Full(R)" is launched.|
The high-quality IP telephone service "KDDI Metal Plus" is launched.The direct access model IP phone service: "KDDI Metal Plus." This new high-quality phone service enables an inexpensive basic fee and calling fee. Also, subscribers can use an internet connection service.
TU-KA Cellular Tokyo Inc., TU-KA Cellular Tokai Inc., and TU-KA Phone Kansai Inc. are merged.
|Agreement reached on comprehensive cooperation on communications business with the Tokyo Electric Power Co. Group.|
Sales of the world's first 1seg-compatible mobile phone begin.A quality TV service only available with a mobile phone that combines TV broadcast viewing and a communications function also incorporated "1seg" compatibility. In addition to providing clear video and audio, this model lets users enjoy receiving data broadcasts that contain a variety of information about TV programs.
|2006||January||KDDI merges with POWEREDCOM.|
The comprehensive music service "LISMO" is launched.The communication industry's first comprehensive music service "au LISTEN MOBILE SERVICE" (abbreviation: LISMO) allows users to seamlessly connect au mobile phones and computers. 2008 saw the startup of "LISMO Video," a service that allows users to watch whole movies and TV dramas with high video and audio quality anytime, anyplace on both au mobile phones and computers. The mascot character "LISMO" also became extremely popular.
|March||Shares of JAPAN CABLENET HOLDINGS and JPAN CABLENET (JCN) are acquired.|
|May||Mobile Net Bank Establishment Investigation Corp. (Now Jibun Bank) is established.|
"HIKARI-one" integrated FTTH services is launched.
|October||Mobile number portability (MNP) is launched.|
"EV-DO Rev.A," an upgraded version of "CDMA2000 1xEV-DO" is adopted.This upgrade actualized the fastest transmission speed in Japan, with a maximum uplink speed of 1.8 Mbps and downlink speed of 3.1 Mbps. Most important, it reduced the stress of uploading items like email with images.
|2007||January||FTTH business integrates with Tokyo Electric Power Co.|
|June||JCN Group becomes a KDDI consolidated subsidiary.|
|September||The "au one" integrated portal for mobile phones and computers is launched.|
"au Smart Sports Run&Walk" service startup
|March||TU-KA service ends.|
|Converted Wireless Broadband Planning Inc. to an operating company, setting the stage to launch UQ Communications Inc.|
|April||CTC shares are purchased, and it becomes a consolidated subsidiary.|
|July||"Jibun Bank," the mobile network bank jointly established with the Bank of Tokyo-Mitsubishi UFJ, begins service.|
|August||"au Collective Talk," which provides free domestic calling between au mobile phones and KDDI fixed telephones, is launched.|
|October||HIKARI-one Home "Giga Value Plan" with speeds up to 1 Gbps is launched.|
UQ Communications begins the UQ WiMAX broadband communication service using mobile WiMAX technology.
The new au mobile phone brand "iida" is announced.
|July||UQ Communications launches UQ WiMAX commercial service.|
Capital participation in Jupiter Telecommunications Co., Ltd. (J:COM).
Planning company for delivery of electronic books (now booklista) established with Sony, Toppan Printing, and The Asahi Shimbun Co.
|2011||February||KDDI Matomete Office Corporation is established.|
|May||au Insurance, mobile phone based general insurance established jointly by KDDI and Aioi Nissay Dowa Insurance, begins service.|
|October||Sales of "iPhone 4S" (made by Apple Inc.) begin.|
au brand logo is reinvented.
|March||"au Smart Value" and "au Smart Pass" are launched.|
|September||Sales of "iPhone 5" (made by Apple Inc.) begin.|
|"au 4G LTE," the next-generation LTE standard for high-speed communication, is launched.|
|2013||April||"KDDI Matomete Office" is launched nationwide.|
|September||Sales of "iPhone 5s/5c" (made by Apple Inc.) begin.|
|December||"au Smart Value mine" is launched.|
|2014||March||Achieved an actual population coverage ratio of 99% for "platinum band" 800MHz "4G LTE"|
|April||Management merger between J:COM and JCN|
|May||"au WALLET" service is launched.|
|Sales of smartphones cable of both "LTE-Advanced (CA)" and "WiMAX 2+" begin.|
|July||Entered into agreement and commenced joint business with Myanma Posts and Telecommunications (MPT).|
|August||The new au "the Unlimited Voice & Data Freedom rate plan" is launched.|
|Establishes the KDDI VALUE ENABLER CORPORATION|
|September||"iPhone 6" and "iPhone 6 Plus" (made by Apple Inc.) begin.|
|October||Begins issuing the "au WALLET Credit Card"|
|December||"au VoLTE," a next-generation voice call service, is launched.|
|2015||August||"au WALLET Market" service is launched.|
|2016||April||"au Denki" electricity supply service is launched.|
|"au Insurance & Loans" financial service is launched.|
|August||"au STAR" membership program is launched.|
|2017||January||Acquired BIGLOBE Inc.|
|August||SORACOM, INC. becomes a consolidated subsidiary.|
|2018||January||AEON Holdings Corporation of Japan becomes a consolidated subsidiary.|