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  2. Phreaking - Wikipedia

    en.wikipedia.org/wiki/Phreaking

    Phreaking began in the 1960s when it was discovered that certain whistles could replicate the 2600 Hz pitch used in phone signalling systems in the United States. [3] Phone phreaks experimented with dialing around the telephone network to understand how the phone system worked, engaging in activities such as listening to the pattern of tones to figure out how calls were routed, reading obscure ...

  3. Prank call - Wikipedia

    en.wikipedia.org/wiki/Prank_call

    Recordings of prank phone calls became a staple of the obscure and amusing cassette tapes traded among musicians, sound engineers, and media traders in the United States from the late 1970s. Among the most famous and earliest recorded prank calls are the Tube Bar prank calls tapes, which centered on Louis "Red" Deutsch.

  4. 555 (telephone number) - Wikipedia

    en.wikipedia.org/wiki/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.

  5. The mystery behind those creepy 'Unknown' spam calls - AOL

    www.aol.com/news/mystery-behind-those-creepy...

    Look up official contact information online and call that number to verify the legitimacy of the initial call. To further protect yourself, enable spam-blocking features on your phone.

  6. 1-800-FREE-411 - Wikipedia

    en.wikipedia.org/wiki/1-800-FREE-411

    Service. Callers dial 1-800 (888 or 866)-FREE411 [373-3411] from any phone in the United States to use the toll-free service. Sponsors cover part of the service cost by playing advertising messages during the call. Callers always hear an ad at the beginning of the call, and then another after they have made their request.

  7. List of country calling codes - Wikipedia

    en.wikipedia.org/wiki/List_of_country_calling_codes

    Zone 1 uses an integrated numbering plan; four digits (1xxx) determine the area served in Canada, the United States and its territories, and much of the Caribbean. Zone 2 uses two 2-digit codes (20, 27) and eight sets of 3-digit codes (21x–26x, 28x, 29x), mostly to serve Africa , but also Aruba , Faroe Islands , Greenland and British Indian ...

  8. Anonymous (hacker group) - Wikipedia

    en.wikipedia.org/wiki/Anonymous_(hacker_group)

    Anonymous (hacker group) Anonymous. An emblem that is commonly associated with Anonymous. The "man without a head" represents anonymity and leaderless organization. [1] Individuals appearing in public as Anonymous, wearing Guy Fawkes masks. Formation.

  9. 211 (telephone number) - Wikipedia

    en.wikipedia.org/wiki/211_(telephone_number)

    211 (telephone number) 211 is a special abbreviated telephone number reserved in the North American Numbering Plan (NANP) as an easy-to-remember three-digit code to reach information and referral services to health, human, and social service organizations. Like the emergency telephone number 911, 211 is one of the eight N11 codes of the North ...