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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.
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When it changed to 10 digit dialing people started having to remember area codes all the time. When 770 came out people started writing 7/ as short hand for the area code, so when 678 was introduced it was treated the same way with a 6/. Atlanta had 10 digit dialing before the rest of the country so it's probably not common in most other areas.
this was the first part of North America to have its code changed three times: from 213 to 714 1951: to 619 in 1982, and to 760 in 1997; was to have originally split off the portion of 760 serving San Diego County to a new 442 area code in late 2008/early 2009; that plan was cancelled; 2009: overlaid by 442; 761
678 was given to both the city and its suburbs in January 1998, becoming the first overlay area code in the state, and forcing mandatory ten-digit dialing for all calls. Flip-flopping on its position on assigning new area codes, the Georgia Public Service Commission dictated that a double split of 912 would occur after that, with 229 and 478 ...
Each NPA was identified by a three-digit area code used as a prefix to each local telephone number. The United States received seventy-seven area codes, and Canada nine. The initial system of numbering plan areas and area codes was expanded rapidly during the ensuing decades, and established the North American Numbering Plan (NANP).
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 and 534; Area codes 716 and 624 ...
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.