Usage of communication technology is controlled by the Ministry of Post and Telecommunications. An adequate nationwide fiber-optic telephone system with 1.18 million fixed lines and expanding mobile coverage is in place. Most phones are installed for senior government officials and installation requires written explanation why the user needs a telephone and how it will be paid for. Cellular coverage is available with a 3G network operated by Koryolink, a joint venture with Orascom Telecom Holding. The number of subscribers has increased from 3,000 in 2002 to almost two million in 2013. International calls through either fixed or cellular service are restricted, and mobile Internet is not available.