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List of international call prefixes
  (Redirected from International Call Prefix)
Not to be confused with list of country calling codes.
An international call prefix or dial out code is a trunk prefix used to select an international telephone circuit for placing an international call. It is now called an IDD prefix (international direct dialing) – a country will typically have an NDD prefix as well (national direct dialing).[1] The international dialing prefix must be dialed before the country calling code and the destination telephone number. It is synonymous with international access code or exit code. The international call prefix is part of the telephone numbering plan of a country for calls to another country.
The International Telecommunication Union (ITU) recommends the sequence 00 as a standard for an international call prefix, and this has been implemented by most countries, but not all of them.[2] Some countries use the 00 prefix which is followed by the international carrier code.
When phone numbers are published for use abroad, they typically show a plus sign (+) prefix in place of any international call prefix, to signify that the caller should use the prefix code appropriate for their country.[3] Many phones allow the plus sign to be entered in their saved number lists, often by holding down the zero (0) key (most GSM mobile phones) or with two consecutive presses of the star (*) key. When making a call, the system then automatically converts the plus sign to the correct international prefix, depending on where the phone is being used, which enables callers to use the same stored number when calling from either their own country or any other.[4]
Example
Calling the Dunedin City Council in New Zealand:
Call placed fromNumber dialedIDD Prefix
China, Italy, the United Kingdom or any other country following the ITU-recommendation00 64 3 477 400000
Canada, United States or any other NANP country direct-dial using the default long distance carrier011 64 3 477 4000011
Canada, United States or any other NANP country direct-dial using an alternative long distance carrier (where xxxx is the carrier number)101 xxxx 011 64 3 477 4000011
Canada, United States or any other NANP country operator assisted using the default long distance carrier01 64 3 477 400001
Japan010 64 3 477 4000010
Australia0011 64 3 477 40000011
Russia (using predefined international call operator)810 64 3 477 4000810
Phones that allow the plus symbol (+), e.g. mobile phone+ 64 3 477 4000auto-generated depending on location of phone
New Zealand03 477 4000N/A (domestic call)
Variations
Some telecommunications service providers or mobile network operators (wireless carriers) have different international call prefix codes which callers or subscribers can use to route calls through specific networks, sometimes with special pricing arrangements.
Many countries also provide alternative dialling arrangements for calls to neighbouring countries.[5]
Some of these variations from the generic codes are shown in the list below (but may be out of date).
Countries by international prefix
Countries using optional carrier selection code
The following is a non-exhaustive list of countries that allow for optional carrier selection in addition to using the standard prefix.
Historic international prefixes
See also
Notes
  1. ^ a b c Kenya, Tanzania and Uganda each can be called from the other two using special short codes: 005 to call Kenya, 006 to call Uganda and 007 to call Tanzania. The shortcode is followed directly by a local number.
  2. ^ "~" means "wait for the next dial tone". Reference: Jan Goyvaerts, Steven Levithan (2009). Regular Expressions Cookbook. O'Reilly. p. 224. ISBN 9780596520687.
References
  1. ^ http://www.dialingnumber.com/dialcode.htm
  2. ^ "E.164 - 12" (PDF). International Telecommunication Union (ITU-T). See page 22 for a list of exceptions
  3. ^ "E.123 - 7.1" (PDF). International Telecommunication Union (ITU-T). See page 9
  4. ^ "The plus (+) sign and international calls". How to call abroad. Archived from the original on 2010-12-15.
  5. ^ "International landline dialing prefix by country". T-Mobile. Archived from the original on 2005-11-26.
External links
Standards and recommendations
Last edited on 29 April 2021, at 21:56
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