NTT Docomo

NTT Docomo, Inc. (株式会社NTTドコモ), stylized as NTT DOCOMO, is a Japanese mobile telecommunications carrier and a subsidiary of NTT, one of the world's leading telecommunications operators. Structured as a joint-stock corporation under the Companies Act of Japan, the company is headquartered in the Sanno Park Tower in Nagatachō, Chiyoda, Tokyo. As the core of the NTT Docomo group—which encompasses 180 subsidiaries and 30 affiliates—the company provides mobile telephone services over its LTE and W-CDMA networks. It is the largest wireless carrier in Japan, with 91.407 million subscribers as of October 2025. The company was incorporated in August 1991 as NTT Mobile Communications Planning Co., Ltd., and officially took over NTT's wireless telecommunication operations in July 1992. It has undergone several name changes throughout its history; it became NTT Mobile Communications Network, Inc. in April 1992, NTT DoCoMo, Inc. in April 2000, and adopted its current capitalized styling in June 2010. Historically, the company decentralized its operations outside the Kanto-Kōshinetsu region. In July 1993, following an agreement between NTT and the Ministry of Posts and Telecommunications (currently the Ministry of Internal Affairs and Communications), it transferred these wireless operations to eight regional subsidiaries. These entities were eventually merged back into the parent company as the surviving entity in July 2008.