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Find out the telephone prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks. The list is organized by world zones and includes the ITU-T standards and the exceptions for political and historical alignment.
Learn about the history, format and categories of telephone numbers in Singapore, regulated by the Info-communications Media Development Authority. Find out how to call Singapore and other countries from Singapore with different access codes.
Find the mobile prefixes for different countries and territories, including Afghanistan, Åland, Algeria, American Samoa, Andorra, Angola, Antigua and Barbuda, Argentina, Armenia, Aruba, Ascension Island, Australia, Austria, etc. The web page also shows the international calling codes, the size of NN (NSN), and the carriers for each prefix.
Learn about the three-digit codes that identify geographic regions and mobile network operators in the public land mobile networks. Find a complete list of MCC/MNC tuples for each country and territory, updated as of January 2024.
Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]
A telephone number is a sequence of digits assigned to a device or subscriber for communication via the public switched telephone network or other networks. Learn about the history, formats, and functions of telephone numbers around the world.
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.
Learn about the structure, format and history of UK telephone numbers, including the country code +44 and the international access code 00. Find out how to dial different types of numbers and services in the UK and its dependencies.
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