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Country codes are defined by the International Telecommunication Union (ITU) in ITU-T standards E.123 and E.164. The prefixes enable international direct dialing (IDD). Country codes constitute the international telephone numbering plan. They are used only when dialing a telephone number in a country or world region other than the caller's.
The calls were transmitted by cable, communications satellite, radio, and more recently, fiber optics and Voice over Internet Protocol (VoIP). International direct dialling was introduced in the 1970s, so calls can be dialed by country code without an operator. International calls can be paid via telephone card (aka phone
When dialing a telephone number, the area code may have to be preceded by a trunk prefix or national access code for domestic calls, and for international calls by the international access code and country code. Area codes are often quoted by including the national access code. For example, a number in London may be listed as 020 7946 0321.
A July 2020 order by the Federal Communications Commission required ten-digit dialing of telephone numbers with area codes in the United States that were not overlaid, but had an assignment of the central office prefix 988, conflicting with its designation for the National Suicide Prevention Lifeline by federal law.
This has led to a significant increase and presence of Mandarin usage in the country, coupled with a strong decline in usage of other Chinese variants. Standard Singaporean Mandarin is nearly identical to the standards of China and Taiwan, with minor vocabulary differences. It is the Mandarin variant used in education, media, and official settings.
The following is a list of countries and territories where Chinese is an official language.While those countries or territories that designate any variety of Chinese as an official language, as the term "Chinese" is considered a group of related language varieties rather than a homogeneous language, of which many are not mutually intelligible, in the context of the spoken language such ...
The North American Numbering Plan (NANP) is a telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1 and has the telephone country code 1. Some North American countries, most notably Mexico, do not participate with the NANP.
For example, a telephone number in North America consists of a three-digit area code, a three-digit central office code, and four digits for the line number. If the numbering plan area does not use an overlay plan with multiple area codes, or if the provider allows it for other technical reasons, seven-digit dialing may be permissible for calls ...