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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 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 code in the group NXX for various other purposes.

  3. Toll-free telephone number - Wikipedia

    en.wikipedia.org/wiki/Toll-free_telephone_number

    Calling an 800-number is free of charge. Calling a 400-number incurs a local access charge. 800-numbers are accessible only to land-line subscribers, while 400-numbers are accessible to all land-line and mobile users. 800-toll-free numbers. 800 toll-free numbers are commonly called "800 免费电话".

  4. List of tallest buildings and structures - Wikipedia

    en.wikipedia.org/wiki/List_of_tallest_buildings...

    The second-tallest structure in the world is the 679-metre-tall (2,227 ft) Merdeka 118 in Kuala Lumpur, Malaysia, while the third-tallest self-supporting structure and the tallest tower in the world is the Tokyo Skytree (634 m or 2,080 ft). The tallest guyed structure is the KRDK-TV mast in North Dakota, U.S. at 630 metres (2,060 ft).

  5. 30 Scam Phone Numbers To Block and Area Codes To Avoid - AOL

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

    800-290-4726 more ways to reach us. Mail. Sign in. Subscriptions; Animals. ... 888 numbers indicate it is a toll-free call. Calls made to toll-free numbers are paid for by the recipient rather ...

  6. National conventions for writing telephone numbers - Wikipedia

    en.wikipedia.org/wiki/National_conventions_for...

    Toll Free: These are usually ten digit numbers beginning with 800 or 400. 800 (toll-free) are accessible only when called from landline phones, while 400 (shared toll) are accessible from all phones. 400 XXX XXXX or 800 XXXX XXXX. Service numbers: These are usually 3- to 5-digit numbers (e.g. Police is 110) used to access an emergency service ...

  7. 800 MHz frequency band - Wikipedia

    en.wikipedia.org/wiki/800_MHz_frequency_band

    The 800 MHz frequency band is a portion of the electromagnetic spectrum, or frequency band, that encompasses 790–862 MHz.. Being a part of the spectrum known as "UHF Bands IV and V" (i.e. 470 MHz to 862 MHz) it was allocated by the ITU to Broadcasting as the primary user in Region 1 and was used for analogue television broadcasting before changing to digital terrestrial television in many ...

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