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On 1 July 2009, telephone numbers in Karachi and Lahore were changed from seven digits to eight digits. This was accomplished by adding the digit "9" to the beginning of any phone number that started with a "9" (government and semi-government connections), and adding the digit "3" to any phone numbers that did not start with the number "9". [1]
E.164 specifies that a telephone number consist of a country code and a national telephone number. National telephone numbers are defined by national or regional numbering plans, such as the European Telephony Numbering Space, the North American Numbering Plan (NANP), or the UK number plan.
Each three-digit area code has a capacity of 7,919,900 telephone numbers (7,918,900 in the United States). Despite widespread use as fictional telephone numbers in the form NXX 555-XXXX, only line numbers 0100 through 0199 are reserved for this purpose, while 1212 and 4334 are the only assigned uses for directory assistance and other functions ...
NANP members are assigned three-digit numbering plan area (NPA) codes under the common country code 1, shown in the format 1 (NPA). 1 North American Numbering Plan; 1 – United States, including United States territories: 1 (340) – United States Virgin Islands; 1 (670) – Northern Mariana Islands; 1 (671) – Guam; 1 (684) – American Samoa
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.
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).
It is the practice of including the area code of a telephone number when dialing to initiate a telephone call. When necessary, the ten-digit number may be prefixed with the trunk code 1 , which is referred to as 1+10-digit dialing or national format .
A telephone number serves as an address for switching telephone calls using a system of destination code routing. [1] Telephone numbers are entered or dialed by a calling party on the originating telephone set, which transmits the sequence of digits in the process of signaling to a telephone exchange.
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