NTT DOCOMO, Inc., a prominent mobile phone operator in Japan, was established in August 1991. The company was originally a spin-off from its parent entity, Nippon Telegraph and Telephone (NTT), to oversee its mobile cellular operations. The term "DOCOMO" is an abbreviation of "do communications over the mobile network", and it also signifies "everywhere" in Japanese. The company's headquarters are located in the Sanno Park Tower, Nagatachō, Chiyoda, Tokyo. The majority stake in DOCOMO was held by NTT until 2020, when the company underwent re-privatisation. However, by the end of 2020, NTT had reacquired DOCOMO for approximately $40 billion. Today, DOCOMO is recognised as the largest wireless carrier in Japan, providing a range of services including phone, video phone, internet, and mail services.
Alias
NTT DOCOMO, Inc.
Country
Japan
Type
Mobile Network Operator
NTT DoCoMo logo

3G Network

The company helped to establish the WCDMA standard for mobile communications and then kick off the first service based on this standard in 2001. The company launched a ratified 3G UMTS network in August 2006. The network used B1, B9, and B19 bands. The last 3G band was shut off in January 2022.

Network Frequency Band Status
B1 (2100 MHz)
Shut Down
B9 (1700 MHz)
Shut Down
B19 (800 MHz)
Shut Down
Date Event Subtype
Launch of 3G Network
Launch

4G Network

The company introduced one of the earliest commercial LTE services in December 2010.

4G Frequency Bands
Network Frequency Band Max. Channel Bandwidth Status
B1 (2100 MHz)
15
Active
B3 (1800 MHz)
20
Active
B19 (850 MHz)
15
Active
B21 (1500 MHz)
15
Active
B28 (700 MHz)
10
Active
Date Event Subtype
Launch of 4G Network
Launch

5G Network

DOCOMO is a world-leading developer of 5G networks, which it plans to deploy in the 2020s by leveraging network function virtualization (NFV) and other technologies. DOCOMO is also driving innovation in NFC infrastructure and services, emerging IoT solutions and many other mobile-related initiatives.

DOCOMO launched 5G mmWave services in September 2020, later adding Sub-6 GHz n77 and n79 in 2C carrier aggregation in December 2020. The network was transitioned to Standalone (SA) mode in December 2021.

Network Frequency Band Max. Channel Bandwidth Status
n77 (3700 MHz)
100
Active
n77 (3700 MHz)
80
Active
n79 (4700 MHz)
100
Active
n257 (28 GHz)
400
Active
Date Event Subtype
Launch of 5G Network
Launch