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Learn how to dial phone numbers in Switzerland using the country code +41 and the national destination codes (NDC) for different regions and services. Find out the short codes for special numbers and the history of the Swiss telephone numbering plan.
Learn how to dial international phone numbers from Australia and other countries using different prefixes. Find out the meaning of 0011, 000, 009 and other codes, and see the list of historic and current prefixes.
E.164 is an ITU-T standard that defines a format for international telephone numbers and other data networks. It consists of a country code, a subscriber number, and optional identification codes, and allows DNS mapping of E.164 numbers for VoIP calls.
A country code is a short alphanumeric identification code for countries and dependent areas. Learn about the different identification systems, such as ISO 3166, ITU, EU, FIFA, and more.
Learn about the telephone number prefixes for reaching foreign countries or areas via international telecommunication networks. Find out the country code for Niger (227) and other countries in different world zones.
Learn how telephone numbers are written and dialed in different countries and regions, according to the ITU recommendation E.123. Compare the formats, lengths, prefixes and codes of landline, mobile, toll free and service numbers.
A telephone prefix is the first set of digits after the country and area codes of a phone number. In North America, it is the first three digits of a local number, and in other countries it may have different lengths and meanings.
Learn how to dial phone numbers in different European countries and territories, including country codes, national number lengths, and international access codes. Find out the European Union roaming and calling regulations and the harmonized service numbers.