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By that date, all telephone callers, even those in area codes that did not yet have interchangeable central office codes, would be required to dial all ten digits for long-distance calls, including such calls within the same area code. Canadian telephone companies made the change in Fall 1994 outside of area code 905, which had already ...
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.
In 1947, the American Telephone and Telegraph Company (AT&T) devised the first nationwide telephone numbering plan and assigned the original North American area codes. The state of California was divided into three numbering plan areas (NPAs) with distinct area codes : 213 , 415 , and 916 , for the southern, central, and northern parts of the ...
Look at the area code: Start by comparing the phone number’s area code to the list of area codes you should never answer. If it’s on the list, there’s a good chance there’s a scammer on ...
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).
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An initial service concept was that customers could move a given seven-digit telephone number when relocating between numbering plan areas. The 500-code would thus be a non-geographic area code. In 1995, AT&T introduced a "follow-me" service under the brand name of AT&T True Connections using area code 500.