KDDI Corporation, a major Japanese telecommunications operator, was formed in 2000 through the merger of KDD (Kokusai Denshin Denwa), DDI (Daini Denden), and IDO (Nippon Idou Tsushin). Since then, it has grown into a leading mobile network, offering innovative services like the 'au' brand, pioneering LTE, and expanding into financial tech and IoT.
Kokusai Denshin Denwa (KDD) is established as Japan's international telecommunications monopoly. It played a key role in connecting Japan globally. #telecom #history
Daini Denden (DDI) is founded as a domestic telecommunications competitor after the liberalization of Japan's telecom market. It later became a core part of KDDI. #telecom #deregulation
Nippon Idou Tsushin (IDO) is established as a mobile phone operator for the Tokyo-Nagoya corridor. It later merged into KDDI. #mobile #telecom
DDI begins cellular phone service using the J-TACS standard, expanding mobile competition in Japan. #mobile #telecom
KDD introduces the first international roaming SIM card in Japan, enhancing global connectivity. #telecom #roaming
DDI begins Personal Handy-phone System (PHS) service, offering low-cost mobile telephony. #telecom #PHS
KDD absorbs its R&D arm to streamline operations. #telecom #merger
DDI launches cellular service based on CDMAOne (IS-95) technology, providing better voice quality and capacity. #telecom #CDMA
DDI, KDD, and IDO merge to create KDDI Corporation, a major integrated telecom operator. The merger aimed to compete with NTT. #telecom #merger
KDDI launches the 'au' mobile brand, originally an acronym for 'access to you'. It becomes the flagship consumer mobile service. #mobile #brand )
KDDI launches Japan's first commercial 3G mobile service using CDMA2000 1x, offering data speeds up to 144 kbps. #telecom #3G
KDDI introduces EZweb, an internet service platform for mobile phones, competing with i-mode. #mobile #internet
KDDI launches the 'WIN' high-speed data service using 1xEV-DO technology, achieving speeds up to 2.4 Mbps. #telecom #data
KDDI acquires Tu-Ka, a cellular operator in the Tokyo region, to expand its network and subscriber base. #telecom #acquisition
KDDI begins deployment of HSPA+ as a step toward LTE, enhancing data speeds. #telecom #LTE
KDDI's mobile subscriber base surpasses 30 million, reflecting strong growth in the Japanese market. #telecom #growth
KDDI launches the 'au one' portal integrating email, web, and services. #mobile #portal
KDDI launches its first Android smartphone, the HTC Magic (IS01), entering the smartphone era. #mobile #android
KDDI launches commercial LTE service under the 'au 4G LTE' brand, offering speeds up to 75 Mbps. #telecom #4G
KDDI acquires cable TV operator Jupiter Telecommunications (J:COM) to offer integrated fixed-mobile services. #telecom #cable
KDDI introduces the 'Urban' smartphone line, targeting design-conscious users. #mobile #smartphone
KDDI provides mobile connectivity for Amazon's Kindle e-readers in Japan. #partnership #ebook
KDDI launches Voice over LTE (VoLTE) service, improving voice call quality and enabling simultaneous voice and data. #telecom #VoLTE
KDDI starts offering IoT connectivity solutions, targeting smart cities and industry. #IoT #telecom
KDDI enters the fintech space with the 'au WALLET' prepaid card and mobile payment service. #fintech #mobilepayment
KDDI begins 5G field trials in partnership with Ericsson and Samsung, preparing for commercial launch. #5G #telecom
KDDI acquires full control of Okinawa Cellular Telephone Company, expanding its rural coverage. #telecom #acquisition
KDDI launches its first 5G commercial service in select Japanese cities, offering ultra-fast mobile internet. #5G #telecom
KDDI launches 'au PAY' credit, a mobile-based credit service, further expanding fintech offerings. #fintech #credit
KDDI collaborates with Toyota on the Woven City project, providing connectivity and IoT infrastructure. #smartcity #partnership
A massive network outage affects KDDI's mobile and fixed services for up to 86 hours, impacting millions of users. #outage #telecom
KDDI introduces Wi-Fi 6E routers for home broadband, leveraging new spectrum for faster speeds. #broadband #WiFi
KDDI partners with SpaceX to provide Starlink satellite internet services in rural Japan. #space #internet
KDDI announces fiscal year revenue exceeding ¥5.5 trillion, driven by 5G and fintech growth. #finance #revenue