According to Allcitycodes, Peru is a country located in South America, bordered by Ecuador, Colombia, Brazil, Bolivia and Chile. It has an area of 1.28 million km2 and a population of over 32 million people. The terrain consists mainly of the western Andes Mountains which are home to the highest peak in Peru, Mount Huascarán at 6,768 meters (22,205 ft) above sea level. The eastern part of the country is mostly flat with vast coastal plains and the Amazon Rainforest in the north. The climate is tropical and subtropical with temperatures ranging from 5°C to 25°C throughout the year and an average annual rainfall of around 1,000 mm. The area code for Peru is +51. This code is used when dialing from outside Peru to any other phone number within it. Additionally, to call a cell phone or landline inside Peru from another country you must dial 00 + 51 + telephone number. There are currently several area codes for different regions across Peru as all numbers are seven digits long starting with two numbers followed by five numbers (e.g xx-xxxxx). Peru also has mobile networks which are operated by Claro, Movistar and Entel which use GSM networks with 3G/4G coverage available on all networks. To call a mobile device within Peru you must dial 00+51+ mobile network prefix + telephone number where the mobile network prefixes are either 9 or 8 depending on whether you are calling a Claro or Movistar/Entel device respectively. Check physicscat for Peru in 2013.