| 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. | 
| 2008 | Nov.: Nanjo Network Center opened | 
| 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.”Apr.: The Osaka Securities Exchange merged Jasdaq Securities Exchange, Inc; Shares listed on JASDAQ Standard, the Osaka Securities Exchange.
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| 2013 | Jul.: Shares listed on the Tokyo Stock Exchange JASDAQ (Standard) in line with the integration of the cash markets of the Osaka Securities Exchange and the Tokyo Stock Exchange Aug.: Main office moved to current location (Matsuyama, Naha City, Okinawa Prefecture) | 
| 2014 | Sep.: Subsidiary Okinawa Value Enabler Co., Ltd. is established (formerly UQ mobile Okinawa Corporation) | 
| 2016 | Mar.: Tomigusuku Network Center opened Aug: Okinawa Value Enabler Co., Ltd. changes trade name to UQ mobile Okinawa Corporation | 
| 2017 | Sep.: Okinawa Cellular Agri & Marche Corporation established through new company split | 
| 2019 | Nov.: Launched au Denki, the au electricity service | 
| 2020 | Apr.: Start of Okinawa-Kyushu submarine cable operations Oct.: Absorption-type merger of UQ mobile Okinawa Corporation | 
| 2021 | Feb.: Renewal of brand slogan: Our Mind, Timeless  Our Challenge, Timeless Jun.: 30th anniversary of establishment Nov.: Completion of Okinawa Cellular Forest Building | 
| 2022 | Apl.: Due to the review of market classification by the Tokyo Stock Exchange, the Tokyo Stock Exchange JASDAQ (Standard) will transition to the Standard Market. Jul.: Okinawa Communication Network Co., Ltd. changes its company name to OTNet | 
| 2023 | Jul.: The operation of the submarine optical cable connecting Okinawa Main Island, Ishigaki Island, Miyako Island, and Kume Island has commenced. Nov.: Through a third-party allocation of new shares, MC Okinawa Co., Ltd. has been made a subsidiary and renamed Okinawa Cellular Mirai Create Co., Ltd. | 
| 2024 | Apl.: Okinawa Cellular has obtained WELL Platinum certification. |