NTT Docomo, Inc. is a Japanese mobile phone operator. Docomo provides phone, video phone (FOMA and Some PHS), i-mode (internet), and mail (i-mode mail, Short Mail, and SMS) services. The company’s headquarters are in the Sanno Park Tower, Nagatachō, Chiyoda, Tokyo. NTT Docomo is the largest wireless carrier in Japan, with 82.632 million subscribers as of March 2021.

Docomo had been spun off from Nippon Telegraph and Telephone (NTT) in August 1991 to take over the mobile cellular operations, although the parent company had the majority stake until the re-privatization in 2020. It provides 2G (mova) PDC cellular services, 3G (FOMA) W-CDMA, 4G LTE and 5G NR services.

NTT Docomo had over 53 million customers (as of March 2008), which is more than half of Japan’s cellular market. The company provides a wide variety of mobile multimedia services. These include i-mode which provides e-mail and internet access to over 50 million subscribers, FOMA, which was launched in 2001 as the world’s first 3G mobile service based on W-CDMA, Xi, a 4G LTE mobile service which was launched on December 24, 2010, Premium 4G, an LTE Advanced service which was launched on March 27, 2015.

In May 2017, NTT Docomo launched 5G trial networks at Aomi, Odaiba (Tokyo Waterfront City) and the area around Tokyo Skytree. NTT Docomo commercially launched its 5G network on March 25, 2020, the first Japanese operator to do so, and making Japan among the first countries in the world to launch 5G.

According to Wikipedia