The Okinawa Discussion Group, established in October 1990 as a vehicle for businessmen of Okinawa and mainland Japan to work together for development of Okinawa, announced its intention to establish a portable phone company. Funded by DDI and other major firms, Okinawa Cellular was established on June 1, 1991, to provide portable and car phone services in the Okinawa region.
| 1992 | Mar. | Ministry of Posts and Telecommunications issues Telecommunications Business License |
|---|---|---|
| Apr. | Main office location changes (Kumoji, Naha City, Okinawa Prefecture) | |
| Jul. | Cellular Phone Service Contract Bylaws approved by Ministry of Posts and Telecommunications | |
| Oct. | Mobile Car Phone TACS (Analog) service starts | |
| 1994 | Apr. | Buyout system offered for portable phone units |
| 1995 | Jul. | Main office location changes (Kumoji, Naha City, Okinawa Prefecture) |
| 1996 | Nov. | PDC (digital) system service starts |
| 1997 | Apr. | Corporate stock registered at Securities Dealers Association of Japan |
| 1998 | Jul. | Start of CDMA service |
| 1999 | May. | Start of "ez web" Internet & e-mail service |
| Nov. | Start of Cell Pre-Phone (prepaid) service | |
| 2000 | Jan. | Start of packet communications service |
| Apr. | Start of international roaming service, "GLOBAL PASSPORT" | |
| Jun. | Application for 3rd generation mobile telephone system (IMT-2000) approved by Ministry of Posts and Telecommunications | |
| Jul. | Start of 3rd generation mobile telephone service with the brand "au" | |
| Sep. | Service end of TACS (analogue) service | |
| 2002 | Apr. | Start of "CDMA2000 1x" service |
| Nov. | Main office location changes (Kumoji, Naha City, Okinawa Prefecture) | |
| 2003 | Mar. | Service end of PDC (digital) service |
| Nov. | Start of CDMA 1X WIN service | |
| 2004 | Dec. | Shop registration cancelled with Japan Securities Dealers Association; Shares listed on Jasdaq Securities Exchange |
| 2006 | Oct. | Start of Mobile Number Portability service |
| Dec. | "EV-DO Rev.A," an upgraded version of "CDMA2000 1xEV-DO" is adopted. | |
| 2007 | Nov. | Launched the "au Purchase Program," which allows customers to select their preferred method of purchasing an au mobile phone. |
| 2009 | Nov. | Launched "eTOKU," a mobile-phone based mail marketing system aimed at distributors and retailers. |
| 2010 | Jan. | Acquired Okinawa Telecommunication Network Co., Inc., through the purchase of new shares allocated to a third party. |
| Mar. | Launched a high-speed Internet and telephone service using optical fiber cables, "au HIKARI Chura." |
