Calling code: +503[1] International call prefix: 00[3] Fixed lines: 1.1 million lines in use, 74th in the world (2012).[1] Mobile cellular: 8.7 million lines, 88th in the world (2012);[1] in 2007 the number of mobile phones exceeded the country's population giving the country a 1.06 per capita cellphone penetration rate.[4] Teledensity: Mobile cellular exceeds 135 per 100 persons (2011).[1] Telephone system: multiple mobile-cellular providers are expanding services rapidly; growth in fixed-line services has slowed in the face of mobile-cellular competition (2011).[1] Satellite earth stations: 1 Intelsat (Atlantic Ocean) (2011).[1] Connected to the Central American Microwave System (2011),[1] a trunk microwave radio relay system that links the countries of Central America and Mexico with each other.[5]