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| 1952 || || Prelude || [[w:Nippon Telegraph and Telephone|Nippon Telegraph and Telephone Public Corporation]] (NTTPC) is founded.<ref name="fundinguniverse.com">{{cite web |title=Nippon Telegraph and Telephone Corporation History |url=http://www.fundinguniverse.com/company-histories/nippon-telegraph-and-telephone-corporation-history/ |website=fundinguniverse.com |accessdate=15 October 2019}}</ref>
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| 1985 || May 30 || Early development || Nippon Telegraph and Telephone Corporation (NTT) launches as a privatized joint stock corporation.<ref name="fundinguniverse.com"/><ref name="docomo-sys.co.jp">{{cite web |title=History |url=https://www.docomo-sys.co.jp/english/company/history.html |website=docomo-sys.co.jp |accessdate=12 September 2019}}</ref>
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| 1986 || April || Funding || Capital investment from {{w|FUJITSU}} and {{w|Hitachi}} increases to 499 million JPY.<ref name="docomo-sys.co.jp"/>
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| 1989 || || Early development|| NTT Docomo commences operation of Nagoya Regional Marketing Branch/The number of employees reached 200".<ref name="docomo-sys.co.jp"/>
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| 1990 1989 || || Personnel || NTT Docomo total sales number of employees reach 10 billion JPY.<ref name="docomo-sys.co.jp"/>
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| 1990 || || Financial || NTT Docomo total sales reach 10 billion JPY.<ref name="docomo-sys.co.jp"/>|-| 1991 || || Early development || NTT Docomo commences operation of its Osaka Regional Marketing Branch.<ref name="docomo-sys.co.jp"/>
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| 1991 || August || Founding || NTT Mobile Communications Network is established as a {{w|spin-off}} by the {{w|Nippon Telegraph and Telephone}} (NTT) to take over the mobile cellular operations.<ref>{{cite web |title=NTT DoCoMo |url=https://www.pcmag.com/encyclopedia/term/48149/ntt-docomo |website=pcmag.com |accessdate=15 October 2019}}</ref><ref>{{cite book |last1=Jain |first1=Vipul |title=Recent Trends in Intelligent Computing, Communication and Devices |url=https://books.google.com.ar/books?id=vUuzDwAAQBAJ&pg=PA1063&lpg=PA1063&dq=August+14,+1991+%22DOCOMO%22&source=bl&ots=QY_R6wQt54&sig=ACfU3U23aehqGfjuSOVoQEEZ5esKOZAwyw&hl=en&sa=X&ved=2ahUKEwjx4ouXjZ_lAhUZILkGHW8YC08Q6AEwCnoECAoQAg#v=onepage&q=August%2014%2C%201991%20%22DOCOMO%22&f=false}}</ref><ref name="crunchbase.com">{{cite web |title=NTT DoCoMo |url=https://www.crunchbase.com/organization/ntt-docomo#section-overview |website=crunchbase.com |accessdate=15 October 2019}}</ref>
| 1992 || || Personnel || NTT DoCoMo number of employees reaches 300.<ref name="docomo-sys.co.jp"/>
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| 1992 || July || Reorganization || 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"/>
