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Country codes are defined by the International Telecommunication Union (ITU) in ITU-T standards E.123 and E.164. The prefixes enable international direct dialing (IDD). Country codes constitute the international telephone numbering plan. They are used only when dialing a telephone number in a country or world region other than the caller's.
This is a listing of lists of country codes: . List of ISO country codes (ISO 3166); ITU country code (International Telecommunication Union) List of country calling codes E.164
This is a list of international dialing prefixes used in various countries for direct dialing of international telephone calls.These prefixes are typically required only when dialling from a landline, while in GSM-compliant mobile phone (cell phone) systems, the symbol + before the country code may be used irrespective of where the telephone is used at that moment; the network operator ...
A call sign can be any number of letters and numerals but each country must only use call signs that begin with the characters allocated for use in that country. With regard to the second and/or third letters in the prefixes in the list below, if the country in question is allocated all callsigns with A to Z in that position, then that country ...
shared by several countries, but in a restricted area of the world: XBR special use: XBY / Abyei area XCQ ex Caroline Islands → FSM + PLW XCS ex TCH Czechoslovakia → CZE + SVK XGZ Gaza Strip: XMM inter-ship communications: XOA International Civil Aviation Organization: XR1 Region 1 (RR 5.3) XR2 Region 2 (RR 5.4) XR3 Region 3 (RR 5.5) XRY
(s) Croatia (FIPS 10-4 country code; ISO 3166 digram – from the country's native name of Hrvatska) (s) Haryana (Indian state code) (i) Harvard Revised star catalogue; Human Resources; HRBL – (i) High-level Representation of Behavior Language (original name of the Herbal language) HRD – (i) Human Resource Development
15 before the local number but after long distance area code for national calls (0 11 15 xxxx-xxxx) and 9 placed after the international access code excluding the 15 for international calls (+54 9 11 xxxx-xxxx).
BUR - IOC code for Burkina Faso [f] (since 1984) [g], and historical ISO and FIFA code for Burma [h] (until 1989) [i] In the following cases, a code for a historical country or territory matches a modern code of the country it merged into: VNM - historical IOC and ISO code for South Vietnam [j], became the ISO code for unified Vietnam [k]