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| 1952–1985 || Nippon Telegraph and Telephone Public Corporation (NTTPC) years.
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| 1985–1992 1985–1991 || Nippon Telegraph and Telephone Corporation (NTT) years.
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| 1992 1991 onwards || NTT Mobile Communications Network, Inc. starts operations,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>
