Telecommunication Company of Iran (TCI) was established in 1971 with a new organizational structure as the main responsible administration for the entire telecommunication affairs, and Iran Telecommunication Industries (ITI) was also founded in the same year to manufacture the required equipment for the national long-distance network. TCI, as the main responsible organization, has utilized the most advanced equipment and services such as digital switching centers, optical fiber cables, mobile phones, data networks, satellite services, and telephone special services during the recent years, and has also succeeded to manufacture more than 80 percent of the required equipment inside Iran.