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List of country calling codes Language Watch Edit Worldwide distribution of country calling codes. Regions are colored by first digit. Country calling codes or country dial-in codes are telephone number prefixes for reaching telephone subscribers in the networks of the member countries or regions of the International Telecommunication Union (ITU). The codes are defined by the ITU-T in standards E.123 and E.164 . The prefixes enable international direct dialing (IDD), and are also referred to as international subscriber dialing (ISD) codes. Country codes are a component of the international telephone numbering plan , and are necessary only when dialing a telephone number to establish a call to another country. Country codes are dialed before the national telephone number. By convention, international telephone numbers are represented by prefixing the country...