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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.
Learn about the format, access codes, and area codes of telephone numbers in the Philippines, including the 02 area code for Metro Manila and Rizal. Find out how to dial domestic and international calls and the history of the open dial plan.
Learn how to dial landline and mobile phone numbers in Vietnam, including area codes, format, and emergency numbers. Find out the country code, international access, and long-distance codes for Vietnam.
Learn about the history and format of the telephone numbering system for twenty-five regions in twenty countries, primarily in North America and the Caribbean. The NANP uses a three-digit area code and a seven-digit local number, with the country code 1.
Learn how to dial and format phone numbers in Honduras, including the country code, international call prefix, and national significant numbers. See the list of fixed line allocations and exchange destinations for different regions and cities.
Learn how to dial landline and mobile phone numbers in China, and the structure and format of the numbering plan. Find out the area codes, trunk prefixes, and mobile service carriers for different regions and provinces.
Learn how to dial international and domestic calls in Mexico using the country code +52 and the ten-digit national number format. Find out the area codes, dialing prefixes, and other service numbers for different regions and cities in Mexico.
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.