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  2. 30 Scam Phone Numbers To Block and Area Codes To Avoid - AOL

    www.aol.com/finance/19-dangerous-scam-phone...

    Here are 19 area codes you should never answer if you don’t know who’s on the other end. ... However, if you get a call from a phone number or area code you don’t know, it’s likely best to ...

  3. Avoid Answering Calls from These Area Codes: Scam Phone ...

    www.aol.com/lifestyle/avoid-answering-calls-area...

    All it takes is a quick glance to know if the call is for real or not. The post Avoid Answering Calls from These Area Codes: Scam Phone Numbers Guide appeared first on Reader's Digest.

  4. List of North American Numbering Plan area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_North_American...

    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.

  5. Toll-free telephone numbers in the North American Numbering ...

    en.wikipedia.org/wiki/Toll-free_telephone...

    The first automated toll-free telephone numbers were assigned with area code 800, created as inbound Wide Area Telephone Service (InWATS) in 1966 (U.S. intrastate) and 1967 (interstate). These terminated on special fixed-rate trunks which would accept calls from a specified calling area with either no limit or a specific maximum number of hours ...

  6. Telephone numbering plan - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbering_plan

    In many parts of North America, especially in area code overlay complexes, dialing the area code, or 1 and the area code, is required even for local calls. Dialing from mobile phones does not require the trunk code in the US, although it is still necessary for calling all long-distance numbers from a mobile phone in Canada.

  7. Routing in the PSTN - Wikipedia

    en.wikipedia.org/wiki/Routing_in_the_PSTN

    For example, in the number (301) 555-1212, 301 is the area code and 555 is the prefix. (The area code is sometimes known as an "NPA," and the area-code and prefix combination is known as an "NPA-NXX.") In the United States, prior to 2021, in some locations, if the call was between two terminals in the same local area (or, two terminals on the ...

  8. N11 code - Wikipedia

    en.wikipedia.org/wiki/N11_code

    An N11 code (pronounced Enn-one-one) is a three-digit dialing code used in abbreviated dialing in the North American Numbering Plan (NANP). The mnemonic N stands for the digits 2 through 9 and thus the syntax stands for the codes 211 , 311 , 411 , 511 , 611 , 711 , 811 , and 911 .

  9. Wardialing - Wikipedia

    en.wikipedia.org/wiki/Wardialing

    If a human or answering machine answers, the wardialer program hangs up. Depending on the time of day, wardialing 10,000 numbers in a given area code might annoy dozens or hundreds of people, some who attempt and fail to answer a phone in two rings, and some who succeed, only to hear the wardialing modem's carrier tone and hang up.