Calling code: +51.[1] International call prefix: 00[8] Fixed lines: 3.4 million lines in use (2012).[4][9] Fixed-line teledensity: about 12 per 100 persons (2010).[4] Mobile subscribers: 15.2 million unique subscribers (end of 2013).[10] Mobile lines: 29.4 million (2012),[4] 29.6 million (2013).[10] Mobile teledensity: exceeds 100 telephones per 100 persons, spurred by competition among multiple providers (2010).[4] Domestic system: nationwide microwave radio relay system and a domestic satellite system with 12 earth stations, which is adequate for most requirements (2010).[4] International communication cables: South America-1 (SAm-1) and Pan American (PAN-AM) submarine cables link to parts of Central and South America, the Caribbean, and the US (2010).[4] International satellite earth stations: 2 Intelsat (Atlantic Ocean) (2010).[4]