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

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

    Toll-free telephone numbers in the North American Numbering Plan. Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, and 888. Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future. 811 is excluded because it is a special dialing ...

  3. Toll-free telephone number - Wikipedia

    en.wikipedia.org/wiki/Toll-free_telephone_number

    800 toll-free numbers are commonly called "800 免费电话". The official name is "被叫集中付费业务" (called party collect paid service), which means the cost of the call is borne not by the caller but by the party receiving the call. 800-toll-free numbers in China are ten-digit numbers beginning with "800". There is no prefix before ...

  4. Fictitious telephone number - Wikipedia

    en.wikipedia.org/wiki/Fictitious_telephone_number

    In North America, the area served by the North American Numbering Plan (NANP) system of area codes, fictitious telephone numbers are usually of the form (XXX) 555-xxxx. The use of 555 numbers in fiction, however, led a desire to assign some of them in the real world, and some of them are no longer suitable for use in fiction.

  5. NIST SP 800-90A - Wikipedia

    en.wikipedia.org/wiki/NIST_SP_800-90A

    NIST SP 800-90A ("SP" stands for " special publication ") is a publication by the National Institute of Standards and Technology with the title Recommendation for Random Number Generation Using Deterministic Random Bit Generators. The publication contains the specification for three allegedly cryptographically secure pseudorandom number ...

  6. 555 (telephone number) - Wikipedia

    en.wikipedia.org/wiki/555_(telephone_number)

    555 (telephone number) The telephone number prefix 555 is a central office code in the North American Numbering Plan, used as the leading part of a group of 10,000 telephone numbers, 555-...., in each numbering plan area (NPA) (area code). It has traditionally been used only for the provision of directory assistance, when dialing NPA-555-1212.

  7. North American Numbering Plan - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering_Plan

    Some businesses still display a 2L-5N number in advertisements, e.g., the Belvedere Construction Company in Detroit, Michigan not only still uses the 2L-5N format for its number (TYler 8-7100), it uses the format for the toll-free number (1-800-TY8-7100).

  8. Vanity number - Wikipedia

    en.wikipedia.org/wiki/Vanity_number

    A vanity number using 2-4-1 as "two for the price of one". A vanity number is a local or free-to-call telephone number for which a subscriber requests an easily remembered sequence of numbers for marketing purposes. While many of these are phonewords (such as 1-800-Flowers, 313-DETROIT, 1-800-Taxicab or 1-800-Battery), occasionally all-numeric ...

  9. Premium-rate telephone number - Wikipedia

    en.wikipedia.org/wiki/Premium-rate_telephone_number

    Numbers starting with 70, 30 and 40 are reserved for premium-rate services. 700, 701, 707 and 300 are "general" premium-rate services (usually charged per minute), 707 and 400 are assigned for tele-voting, mass-calls and so on (usually charged per call). Other numbers (702-706, 709, 301–309, 401-409) are reserved for future assignments.