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Telephone numbers in area code 678 were first assigned to customers signing up for new telephone service on January 15, 1998. On September 2, 2001, area code 470, was added to the 678 overlay area of area codes 404 and 770. [1] Telephone numbers from the NPA were assigned after exhaustion of area code 678.
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.
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The largest telephone numbering plan in North American is the North American Numbering Plan (NANP), serving 25 regions or countries. Other countries maintain an autonomous numbering plan with distinct country codes within the international E.164 specifications by the International Telecommunication Union.
Area code 670; Area code 671; Area codes 678, 470, and 943; Area code 679; Area code 680; Area code 682; Area code 684; Area code 700; Area code 701; Area codes 702 and 725; Area code 703; Area codes 704 and 980; Area codes 706 and 762; Area codes 707 and 369; Area codes 708 and 464; Area code 710; Area code 712; Area code 713; Area codes 715 ...
Initially, area codes with the middle digit 0 were assigned to numbering plan areas that comprised an entire state or province, while jurisdictions with multiple numbering plan areas received area codes having 1 as the second digit. As network growth could not be predicted accurately over more than a few years, this pattern was abandoned by ...
The state operated with two area codes until May 3, 1992, when area code 706 was created for the two separate areas outside of the metro Atlanta area. Due to complaints from exurban residents who were to be put in 706, they were moved back into 404, which makes every new area code added to the metro area run out of numbers sooner.
Area code 404 is a telephone area code in the North American Numbering Plan (NANP) for Atlanta, Georgia and its closest suburbs. This comprises roughly the area encircled by Interstate 285. It is an enclave area code, surrounded by area code 770, which serves most of Atlanta's suburbs. Both 404 and 770 are overlaid by area codes 678, 470, and 943.