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| 1952–1985 || Nippon Telegraph and Telephone Public Corporation (NTTPC) prelude era.
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| 1985–1991 1985–1992 || Nippon Telegraph and Telephone Corporation (NTT) prelude era.
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| 1991 1992 onwards || NTT Docomo era, starting with its initial name NTT Mobile Communications Network era.
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| 1999 || NTT Docomo launches the world's first mobile Internet-services platform.<ref name="Overviewdd">{{cite web |title=Overview |url=https://www.nttdocomo.co.jp/english/corporate/about/outline/ |website=nttdocomo.co.jp |accessdate=15 October 2019}}</ref>
| 1992 || || || "Relocated head office to Ikebukuro from Koji-Machi, Chiyoda-Ku/The number of employees reached 300"<ref name="docomo-sys.co.jp"/>
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| 1992 || July || || NTT Mobile Communications Network assumes control of mobile communications business of the reorganizing [[w:Nippon Telegraph and Telephone|Nippon Telegraph and Telephone Corporation]] (NTT).<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 || March || Service || NTT MCN Launches mova 2G (800 MHz) digital cellular phone service.<ref name="History"/>
