Nippon Telegraph and Telephone Corporation, through its subsidiaries, provides fixed voice-related, mobile voice-related, IP/packet communications, and system integration services in Japan and internationally. It operates through five segments: Mobile Communications Business, Regional Communications Business, Long Distance and International Communications Business, Data Communications Business, and Other Business. The Mobile Communications Business segment offers mobile phone services and related services, including LTE mobile phone and other services. The Regional Communications Business segment provides intra-prefectural communications services and related ancillary services, such as FTTH and other services. The Long Distance and International Communications Business segment offers domestic inter-prefectural communications services, services related to the international communications business, and services related to the solutions business and related services. It primarily provides cloud, data center, migration support, and other services. The Data Communications Business segment offers network system and system integration services comprising ERP services, ICT outsourcing, and other services. The Other Business segment engages in the real estate, finance, construction and power, systems development, and advanced technologies development businesses. The company also sells telecommunications equipment. As of March 31, 2019, it had 18,500 thousand fixed line subscriptions. The company was founded in 1952 and is headquartered in Tokyo, Japan.