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E.123, national format: long-distance prefix and city code in parentheses (national format: long-distance prefix and settlement code in parentheses due to possible confusion needs constant additional clarification), п. 2.8 [11]), the phone number is separated from the code and separated by spaces +380 (44) 1234567
Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC). NPAs with 9 in the second position are reserved for future format expansion.
For example, 234 235-5678 is a valid telephone number; with area code 234, central office prefix (exchange) 235, and line number 5678. The number 234 911-5678 is invalid, because the central office code must not be in the form N11.
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.
AT&T divided the United States and Canada into numbering plan areas (NPAs), and assigned to each NPA a unique three-digit prefix, the numbering plan area code, which became known in short-form as NPA code or simply area code. The area code is prefixed to each telephone number issued in its service area.
The current dialling plan is in force since 4 June 2011 when a wide-ranging reform took place. Specifically, area codes were updated to start with 2 or 3, mobile numbers came to begin with the digit 5, and some geographical numbers were padded with an additional digit 2 or 3 immediately after the area code to the total number of digits equalling 9.
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]
Making a single code per carrier, after each carrier had to have multiple codes. And making the NSN 10 digits after it was 9. Dialing format inside Egypt is 01X XXXX XXXX, International format is 20 1X XXXX XXXX; 11: Etisalat: 12: Orange Egypt: 15: WE Egypt El Salvador +503: 6: 8: Users can now switch carriers and keep their cell phone numbers ...