International dialing prefixes are used when dialing international telephone calls by telephone users. These prefixes are typically required only when dialling from a landline, while in GSM-compliant mobile phone (cell phone) systems, the symbol + before the destination country code may be used irrespective of the location of the telephone when dialing. The network operator provides the access codes automatically.
Countries by international prefix
Countries using carrier selection codes The following is a non-exhaustive list of countries that optionally allow for carrier selection in addition to using the standard prefix listed in the preceding section.
Historic international prefixes The following are international call prefixes that were used in various countries sometime in the past but are no longer used.
See also List of telephone country codes List of North American Numbering Plan area codes Public switched telephone network
Notes
References
External links Standards and recommendations "E.164: The international public telecommunication numbering plan" (PDF). International Telecommunication Union. 2005-02-01. "OB 1114: List of ITU-T Recommendation E.164 assigned country codes" (PDF). Annex to ITU Operational Bulletin. International Telecommunication Union. 2016-12-15. "OB 994: Dialling Procedures" (PDF). Annex to ITU Operational Bulletin. International Telecommunication Union. 2011-12-15.