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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]
The U.S. state of Alabama is served by six area codes. When the North American Numbering Plan was first defined in 1947, Alabama was a single numbering plan area (NPA), with area code 205. This configuration existed until 1995 when area code 334 was added for the southeastern part of the state. In 1998, area code 256 was assigned for northern ...
Users can switch carriers while keeping number and prefix (so prefixes are not tightly coupled to a specific carrier). 7 Claro 8: Instituto Costarricense de Electricidad (Kölbi) Croatia +385: 91: 9: A1 Hrvatska: Due to Mobile number portability the prefix of an existing number does not determine the carrier. Any new number will follow the ...
Worldwide distribution of country calling codes. Regions are coloured by first digit. Telephone country codes, but also sometimes referred to as "country dial-in codes", or historically "international subscriber dialing" (ISD) codes in the U.K., are telephone number dialing prefixes for reaching subscribers in foreign countries or areas via international telecommunication networks.
Area codes 205 and 659 are telephone area codes in the North American Numbering Plan (NANP) for the western and central parts of the U.S. state of Alabama, including the cities of Birmingham and Tuscaloosa. Area code 205 was one of the original North American area codes created in 1947 when AT&T created the first continental telephone numbering ...
A telephone prefix is the first set of digits after the country, and area codes of a telephone number. In the North American Numbering Plan countries (country code 1), it is the first three digits of a seven-digit local phone number, the second three digits of the 3-3-4 scheme. In other countries, both the prefix and the number may have ...
Counties of Alabama Alabama counties (clickable map) Location State of Alabama Number 67 Populations Greatest: 662,895 (Jefferson) Least: 7,341 (Greene) Average: 76,246 (2023) Areas Largest: 1,590 sq mi (4,100 km 2) (Baldwin) Smallest: 535 sq mi (1,390 km 2) (Etowah) Average: 782 sq mi (2,030 km 2) Government County government Subdivisions cities, towns, unincorporated communities, census ...
Region covered by area code 251 in Alabama. Area code 251 is a telephone area code in the North American Numbering Plan (NANP) for southwestern Alabama, serving Mobile, Baldwin, and Washington counties and parts of six other counties. [1] It was created on June 18, 2001, as a split from area code 334. [2]