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In NANP telephone number specifications, the letter N represents a numeral from 2 through 9, while the letter X represents any numeral. Thus, NXX is a number from 200 through 999, while XXXX is a range from 0000 through 9999. The first three digits of a telephone number are the numbering plan area code (NPA code, or simply NPA).
The prefixes in the Americas start with one of 1,2,5. All countries in the Americas use codes that start with "5", with the exception of the countries of the North American Numbering Plan, such as Canada and the United States, which use country code 1, and Greenland and Aruba with country codes starting with the digit "2", which mostly is used by countries in Africa.
There are names for numbers larger than crore, but they are less commonly used. These include arab (100 crore, 1 billion), kharab (100 arab, 100 billion), nil or sometimes transliterated as neel (100 kharab, 10 trillion), padma (100 nil, 1 quadrillion), shankh (100 padma, 100 quadrillion), and mahashankh (100 shankh, 10
The total length of the Subscriber Trunk Dialing code and the phone number is ten digits. The Subscriber Trunk Dialing code can have from two digits (11 or 011) up to four digits. Mobiles: Written as AAAAA-BBBBB for ease of remembering (though the prefix is either 2-digits or 4-digits in the numbering plan). Mobile numbers which are not local ...
Many countries use fixed-length numbers in a so-called closed numbering plan. [5] A prominent system of this type is the North American Numbering Plan. In Europe, the development of open numbering plans was more prevalent, in which a telephone number comprised a varying count of digits. Irrespective of the type of numbering plan, "shorthand" or ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 3 February 2025. See also: Orders of magnitude (numbers) and Long and short scales Natural number 1000000000 List of numbers Integers ← 10 0 10 1 10 2 10 3 10 4 10 5 10 6 10 7 10 8 10 9 Cardinal One billion (short scale) One thousand million, or one milliard (long scale) Ordinal One billionth (short ...
E.164 permits a maximum length of 15 digits for the complete international phone number consisting of the country code, the national routing code (area code), and the subscriber number. E.164 does not define regional numbering plans, however, it does provide recommendations for new implementations and uniform representation of all telephone ...
An important reason for grouping is that it allows rapid judgement of the number of digits, via telling at a glance ("subitizing") rather than counting (contrast, for example, 100 000 000 with 100000000 for one hundred million).