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| 1992 || July 1 || Reorganization || NTT Mobile Communications Network begins operations and assumes control of mobile communications business of the reorganizing [[w:Nippon Telegraph and Telephone|Nippon Telegraph and Telephone Corporation]] (NTT).<ref name="Communication"/><ref name="History">{{cite web |title=History |url=https://www.nttdocomo.co.jp/english/corporate/about/outline/history/ |website=nttdocomo.co.jp |accessdate=11 September 2019}}</ref> This event is considered to be the birth of NTT DoCoMo, after the cellular communications services of NTT are carved out from the former telecom monopolist's other lines of business.<ref name="i-mode Wireless">{{cite web |title=NTT DoCoMo: i-mode Wireless Internet Services |url=https://www.bus.umich.edu/kresgepublic/journals/gartner/research/96500/96594/96594.html |website=bus.umich.edu |accessdate=16 October 2019}}</ref>
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| 1993 || || || Japan moves to digital mobile services as DoCoMo launches a new service based on Personal Digital Cellular (PDC) technology.<ref name"dfgghj"/>
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| 1993 || March || Service || NTT MCN Launches mova 2G (800 MHz) digital cellular phone service.<ref name="History"/>
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| 1993 || || || Nearly 70 percent of new NTT pager subscribers are individuals instead of companies.<ref name="Communication"/>
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| 1994 || || Background || The mobile phone market is opened to competition.<ref name"dfgghj"/>
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| 1994 || April || Service || NTT MCN launches CITYPHONE 1.5 GHz digital cellular phone service in urban areas.<ref name="History"/>
| 1998 || || Recognition || NTT MCN acquires ISO9001 accreditation, an international standard used by organizations to demonstrate the ability to consistently provide products and services that meet customer and regulatory requirements.<ref>{{cite web |title=WHAT IS ISO 9001:2015 – QUALITY MANAGEMENT SYSTEMS? |url=https://asq.org/quality-resources/iso-9001 |website=asq.org |accessdate=16 October 2019}}</ref><ref name="docomo-sys.co.jp"/>
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| 1998 || October 12 || Financial || NTT MCN goes public on the {{w|Nikkei 225}} average.<ref>{{cite web |title=NTT Mobile Communications Network |url=https://money.howstuffworks.com/10-biggest-ipos8.htm |website=money.howstuffworks.com |accessdate=15 October 2019}}</ref> The company is registered under the ticker TYO:9437.<ref name="crunchbase.com"/> NTT sells 30% of DoCoMo to the public.<ref name"dfgghj"/>
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| 1998 || October 22 || Financial || NTT MCN is listed on the {{w|Tokyo Stock Exchange}}.<ref name="i-mode Wireless"/>
