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  2. North American Numbering Plan - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering_Plan

    The second NXX block is the central office code. Permissible numbers exclude easily recognizable codes N11, used for special services. Also called exchange code: XXXX Line number A unique four-digit number for each NPA, from 0000 to 9999: Also called station code

  3. Telephone numbers in Colombia - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_colombia

    All landline subscriber numbers follow the pattern: 60B-YXX-XXXX; Where B is the dialing zone (where the number is located), Y is 2 to 8 (or 9 for pay phones), [2] [failed verification] and X is any digit.

  4. Automatic number identification - Wikipedia

    en.wikipedia.org/wiki/Automatic_number...

    Modern toll-free telephone numbers, which generate itemized billing of all calls received instead of relying on the special fixed-rate trunks of the Bell System's original Inward WATS service, depend on ANI to track inbound calls to numbers in special area codes such as +1-800, 888, 877, 866, 855, 844, and 833 with 822 reserved for future toll free use (United States and Canada), 1800 ...

  5. Telephone numbers in Palau - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Palau

    LIST OF AREA CODES [1]; Prefix Location +680 544 xxxx: Aimeliik State +680 587 xxxx: Airai State +680 277 xxxx: Angaur State +680 876 xxxx: Kayangel State +680 488 xxxx: Koror State +680 654 xxxx

  6. List of country calling codes - Wikipedia

    en.wikipedia.org/wiki/List_of_country_calling_codes

    Worldwide distribution of country calling codes. Regions are coloured by first digit. Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.

  7. Telephone keypad - Wikipedia

    en.wikipedia.org/wiki/Telephone_keypad

    The use of alphanumeric codes for area codes was abandoned in Europe when international direct dialing was introduced in the 1960s, because, for example, dialing VIC 8900 on a Danish telephone would result in a different number to dialling it on a British telephone. At the same time, letters were no longer placed on the dials/keypads of new ...

  8. What You Need to Know About Phone Scams - AOL

    www.aol.com/know-phone-scams-180248742.html

    Scammers know how to fake a phone number. Kerskie describes a scam where a client received a spoof call from what he thought was his daughter’s phone. The caller claimed his daughter was in ...

  9. Card security code - Wikipedia

    en.wikipedia.org/wiki/Card_security_code

    There are several types of security codes and PVV (all generated from DES key in the bank in HSM modules using PAN, expiration date and service code): . The first code, 3 numbers, called CVC1 or CVV1, is encoded on track one and two of the magnetic stripe of the card and used for card present transactions, with signature (second track also contains pin verification value, PVV, but now it is ...

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