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An "international call prefix", "international dial-out code" or "international direct dial code" (IDD code) is a trunk prefix that indicates an international phone call. In the dialling sequence, the prefix precedes the country calling code (and, further, the carrier code, if any, and the destination telephone number ).
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 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 ...
The term country code frequently refers to ISO 3166-1 alpha-2, ... (ISD) code, is a telephone number prefix used in international direct dialing (IDD) ...
An additional digit has been added to the code of every carrier. Making a single code per carrier, after each carrier had to have multiple codes. And making the NSN 10 digits after it was 9. Dialing format inside Egypt is 01X XXXX XXXX, International format is 20 1X XXXX XXXX; 11: Etisalat: 12: Orange Egypt: 15: WE Egypt El Salvador +503: 6: 8
Insulin-dependent diabetes, called diabetes mellitus type 1; Interictal dysphoric disorder; International direct dialing, in telephony; Iodine deficiency disorders, commonly used when discussing IDD eradication programs
"United Nations Code for Trade and Transport Locations". UN/LOCODE 2011-2. UNECE. 28 February 2012. - includes IATA codes "ICAO Location Indicators by State" (PDF). International Civil Aviation Organization. 17 September 2010. Archived from the original (PDF) on 25 March 2019; Aviation Safety Network - IATA and ICAO airport codes
These included a refusal to recognise Gibraltar's International Direct Dialling (IDD) code (+350) which restricted the expansion of Gibraltar's telephone numbering plan, and the prevention of roaming arrangements for Gibraltar GSM mobile phones in Spain and vice versa. [5]