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  2. 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".

  3. 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 ...

  4. National conventions for writing telephone numbers - Wikipedia

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

    Cellphone numbers are assigned the 1-digit area code 6, leaving eight digits for the subscriber's number: 06-CBBBBBBB, where subscriber's number ('C') is neither 6 nor 7. Service numbers (area codes 800, 900, 906 and 909) have either 4 or 7 remaining digits, making them 8 or 11 digits in total: 0AAA-BBBB or 0AAA-BBBBBBB. The area code 14 has no ...

  5. 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 ...

  6. Image resolution - Wikipedia

    en.wikipedia.org/wiki/Image_resolution

    For practical purposes the clarity of the image is decided by its spatial resolution, not the number of pixels in an image. In effect, spatial resolution is the number of independent pixel values per unit length. The spatial resolution of consumer displays ranges from 50 to 800 pixel lines per inch.

  7. Comparison of ICBMs - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_ICBMs

    800 kt Active 1985 No Road-mobile TEL: 200–900 m 6 RT-2PM2 Topol-M: Russia: Votkinsk Machine Building Plant 11,000 km 47,200 kg 800 kt Active 1994 No Silo, road-mobile TEL 200 m 7 RS-24: Russia Votkinsk Machine Building Plant 12,000 km 49,000 kg 3-4 x 300 kt Active 2007 Yes Silo, road-mobile TEL 150 m 8 R-29R: Russia State Rocket Center Makeyev

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