Changes

| 1999 || February || Cellular network {{w|Mobile web}} || Milestone (service launch) || NTT MCN introduces its 2.5G {{w|i-mode}}, the first such service with national coverage.<ref name="The Six Immutable"/> {{w|i-mode}} is the world's first mobile internet service available through the handset itself. Before this, there no terminal other than personal computers for accessing the internet.<ref name="Hidenori Tomita">{{cite book |title=The Post-Mobile Society: From the Smart/Mobile to Second Offline |edition=Hidenori Tomita |url=https://books.google.com.ar/books?id=snn7CwAAQBAJ&pg=PA28&lpg=PA28&dq=docomo+launches+dmenu&source=bl&ots=mj4I-8pl6E&sig=ACfU3U1jIyYGnNoaHGnXTb_xxa9lHQ7ELA&hl=en&sa=X&ved=2ahUKEwi5hL_M76fnAhXnHbkGHQpaB2gQ6AEwCHoECAkQAQ#v=onepage&q=docomo%20launches%20dmenu&f=false}}</ref>

| 1999 || August 8 || Cellular network {{w|Mobile web}} || Userbase || {{w|i-mode}} grows to 1 million subscribers.<ref name="The Six Immutable"/>

| 1999 || December || Cellular network {{w|Mobile web}} || Userbase || {{w|i-mode}} grows to 3 million subscribers.<ref name="The Six Immutable"/>

| 2000 || August 6 || Cellular network {{w|Mobile web}} || Userbase || Subscriptions for {{w|i-mode}} in Japan reaches 10 million.<ref name="sds"/>

| 2000 || November 22 || Cellular network {{w|Mobile web}} || Userbase || Subscriptions for {{w|i-mode}} in Japan reaches 10 million.<ref name="sds"/><ref name="The Six Immutable"/>

| 2001 || March 4 || Cellular network {{w|Mobile web}} || Userbase || Subscriptions for {{w|i-mode}} in Japan reaches 20 million.<ref name="sds"/>

| 2001 || May || Cellular network {{w|Mobile web}} || Userbase || i-mode grows to 23 million subscribers.<ref name="The Six Immutable"/>

| 2001 || July 1 || Cellular network {{w|Mobile web}} || Userbase || Subscriptions for {{w|i-mode}} in Japan reaches 25 million.<ref name="sds"/>

| 2001 || December 25 || Cellular network {{w|Mobile web}} || Userbase || Subscriptions for {{w|i-mode}} in Japan reaches 30 million.<ref name="sds"/>

| 2001 || October 14 || Cellular network {{w|Mobile web}} || Userbase || Subscriptions for {{w|i-mode}} in Japan reaches 35 million.<ref name="sds"/>

| 2003 || May 26 || Website {{w|Mobile web}} || Service launch || {{w|NTT Docomo}} launches online shopping mall and account aggregation portal DoCommerce, which enables both 2G and 3G SSL-compatible {{w|i-mode}} handset users to manage their finances and shop online with their credit cards. The online mall launches with 10 virtual shops selling items such as accessories, perfumes and healthcare goods.<ref>{{cite web |title=NTT DoCoMo launches mobile shopping mall and account aggregation portal |url=https://www.finextra.com/newsarticle/8935/ntt-docomo-launches-mobile-shopping-mall-and-account-aggregation-portal |website=finextra.com |accessdate=18 January 2020}}</ref>

| 2003 || October 30 || Cellular network {{w|Mobile web}} || Userbase || Total subscribers to {{w|2G}} and {{w|3G}} {{w|i-mode}} mobile internet service in Japan surpass 40 million.<ref name="sds">{{cite web |title=i-mode Subscribers Surpass 40 million |url=https://www.nttdocomo.co.jp/english/info/media_center/pr/2003/001115.html |website=nttdocomo.co.jp |accessdate=19 January 2020}}</ref>

| 2004 || January 9 || {{w|Mobile web}} || Service launch || {{w|NTT Docomo}} announces the launch of an {{w|i-mode}} Disaster Message Board service allowing i-mode subscribers in Japan to post personal messages at a special i-mode site (provided in Japanese only) in the event of major calamities such as high-magnitude {{w|earthquake}}s.<ref>{{cite web |title=NTT DoCoMo to Launch i-mode Disaster Message Board Service |url=https://www.nttdocomo.co.jp/english/info/media_center/pr/2004/001135.html |website=nttdocomo.co.jp |accessdate=12 November 2019}}</ref>

| 2009 || October 27 || {{w|Mobile web}} || Service || {{w|NTT Docomo}} introduces a new service that allows [[w:Freedom of Mobile Multimedia Access|FOMA]] users to send and receive domestic {{w|i-mode}} mails.<ref>{{cite web |title=DOCOMO to Offer Unlimited Domestic i-mode Mails |url=https://www.nttdocomo.co.jp/english/info/media_center/pr/2009/001457.html |website=nttdocomo.co.jp |accessdate=26 January 2020}}</ref>

| 2010 || November 8 || {{w|Mobile web}} || Service || {{w|NTT Docomo}} announces launch of an {{w|i-mode}} version of its “docomo market” mobile portal to provide the more than 48 million Docomo customers using i-mode-enabled handsets with simplified access to a range of mobile applications, music and electronic books.<ref>{{cite web |title=DOCOMO to Launch i-mode Version of “docomo market” Portal |url=https://www.nttdocomo.co.jp/english/info/media_center/pr/2010/001493.html |website=nttdocomo.co.jp |accessdate=26 January 2020}}</ref>

| 2011 || Mid–November || {{w|Mobile web}} || Service || {{w|NTT Docomo}} launches two new services for smartphones, “dmenu” and “dmarket.” The dmenu portal is aimed to provide a wide range of apps and other content from diverse providers, as well as enriched versions of the popular {{w|i-mode}} content, optimized for easy-to-use smartphone interfaces. The new dmarket content store is aimed at offering a large amount of other content, including movies, music, {{w|e-book}}s and [[w:Android (operating system)|Android]].<ref>{{cite web |title=DoCoMo unveils 24 new mobile devices |url=https://japantoday.com/category/tech/docomo-unveils-24-new-mobile-devices |website=japantoday.com |accessdate=29 January 2020}}</ref>

| 2020 || January 24 || Cellular network || {{w|Research and development}} || {{w|NTT Docomo}} releases a white paper on the topic of {{w|6G}}, the sixth-generation mobile communications system that the company aims to launch on a commercial basis by 2030. The paper contains the company's views in the field of 5G evolution and 6G communications technology, areas that it has been researching since 2018.<ref>{{cite web |title=DOCOMO Releases White Paper Promoting 6G Communication System |url=https://www.nttdocomo.co.jp/english/info/media_center/pr/2020/0124_00.html |website=nttdocomo.co.jp |accessdate=24 January 2020}}</ref>

| 2020 || July || Cellular network || Infrastructure || {{w|NTT Docomo}} plans to have {{w|5G}} base stations in all 47 Japanese prefectures by this time.<ref name="venturebeat.com">{{cite web |title=NTT Docomo moves up Japan-wide 5G to June 2020, offers early access |url=https://venturebeat.com/2019/09/19/ntt-docomo-moves-up-japan-wide-5g-to-june-2020-offers-early-access/ |website=venturebeat.com |accessdate=18 November 2019}}</ref>

| 2021 || Spring || Cellular network || Infrastructure || {{w|NTT Docomo}} plans to reach a total of 10,000 {{w|5G}} base stations by this time.<ref name="venturebeat.com"/>

| 2026 || March || {{w|Mobile web}} || Service shutdown || {{w|NTT Docomo}} plans to discontinue its internet-capable mobile phone system {{w|i-mode}} (introduced in 1999) by this time, due to a dwindling number of users.<ref>{{cite web |title=NTT Docomo to discontinue decades-old i-mode, world's first mobile internet service, in 2026 |url=https://www.japantimes.co.jp/news/2019/10/29/business/tech/ntt-docomo-discontinue-decades-old-mode-worlds-first-mobile-internet-service-2026/#.XdLzPNX0mUk |website=japantimes.co.jp |accessdate=18 November 2019}}</ref>