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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.
After the success of these trials, [23] [27] expansion of the numbering plan accelerated with new crossbar systems and four new area codes in 1953, and seven in 1954. By the end of the decade thirty-one new area codes had been created in addition to the initial allotment of 1947. [28] to satisfy the post-war surge in demand for telephone service.
This is a list of telephone area codes of Pennsylvania. In 1947, the American Telephone and Telegraph Company divided Pennsylvania into four numbering plan areas (NPAs) and assigned distinct area codes for each. Since 1995, several relief actions in form of area code splits and overlays have expanded the list of area
Using 0 or 1 as the first digit of an area code or central office code is invalid, as is a 9 as the middle digit of an area code; these are trunk prefixes or reserved for North American Numbering Plan expansion. For example, 234 235-5678 is a valid telephone number; with area code 234, central office prefix (exchange) 235, and line number 5678.
Cellphone numbers are assigned the 1-digit area code 6, leaving eight digits for the subscriber's number: 06-CBBBBBBB, where subscriber's number ('C') is neither 6 nor 7. Service numbers (area codes 800, 900, 906 and 909) have either 4 or 7 remaining digits, making them 8 or 11 digits in total: 0AAA-BBBB or 0AAA-BBBBBBB. The area code 14 has no ...
xx 6: 11: Mobile phones use geographic area codes (two digits): after that, all numbers assigned to mobile service have nine digits, starting with 6, 7, 8 or 9 (example: 55 15 99999–9999). 90 is not possible, because collect calls start with this number. [5] xx 7: xx 8: xx 9: British Indian Ocean Territory +246: 380 7 387 British Virgin ...
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 2016, area code 614 was overlaid with 380 in the Columbus/Central Ohio area for the same reason. In 2020, 326 was added as an all services overlay for 937. Area code 283 was added as an overlay for 513 on April 28, 2023. [2] [3] Area code 436 went into service on March 1, 2024, as an overlay of 440. [4]