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

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

    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. This is why you should never call back an unknown number - AOL

    www.aol.com/article/lifestyle/2019/05/03/this-is...

    So if your bank leaves a voicemail, don’t just call back the number from the missed call. Find the official number online and dial that, suggests Levin. “Never trust—always verify,” he says.

  6. 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 ...

  7. Misdialed call - Wikipedia

    en.wikipedia.org/wiki/Misdialed_call

    Deployment of multiple toll-free area codes further increases the probability of misdial calls as a common wrong number pattern is to call the +1-800- version of a number which is actually in another area code. In 2009, General Motors advertised +1-877-CLUNKER (1-877-258-6537) to promote a $3 billion U.S. federal "cash for clunkers" program.

  8. North American Numbering Plan - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering_Plan

    American television programs and movies often use the central office code 555, or KLamath 5 and KLondike 5 for older periods, in fictitious telephone numbers to prevent disturbing telephone subscribers if anyone dials a telephone number seen or referred to on screen. Not all numbers beginning with 555 are fictional.

  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.