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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. 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 ...

  5. List of common display resolutions - Wikipedia

    en.wikipedia.org/wiki/List_of_common_display...

    800: ×: 480 5∶3: 5∶3: 1∶1: 384,000: W-PAL Wide PAL: 848: ×: 480 53∶30 : 16∶9: 1.006 407,040: FWVGA: List of mobile phones with FWVGA display: 854: ×: 480 427∶240 : 16∶9: 0.999 409,920: SVGA: Super VGA Nintendo Wii, Nintendo 64 HiRes, GameCube HiRes 800: ×: 600 4∶3: 4∶3: 1∶1: 480,000: qHD: Quarter FHD: AACS ICT, HRHD ...

  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. Hardness comparison - Wikipedia

    en.wikipedia.org/wiki/Hardness_comparison

    Hardness comparison table. Brinell HB. (10 mm Ball, 3000 kg load) Vickers HV. (5 kg) Rockwell C HRC. (120 degree cone 150 kg) Rockwell B HRB. (1/16" ball 100 kg)

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