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

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

    The SMS/800 database and RespOrg structure are used in the U.S. and Canada. A few specific exchanges remain reserved or are assigned to specific North American Numbering Plan countries which do not draw numbers from the SMS/800 pool: Some 800-NXX prefixes are reserved for the following areas: 800-389 for the Bahamas; 800-534 for Barbados

  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. 1-800-COLLECT - Wikipedia

    en.wikipedia.org/wiki/1-800-COLLECT

    1-800-COLLECT (1-800-265-5328) is a 1-800 number, owned and operated by WiMacTel, which provides fixed rate collect calling in the United States. The service was launched by MCI in 1993. History

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  6. Rockwall, Texas - Wikipedia

    en.wikipedia.org/wiki/Rockwall,_Texas

    Rockwall is a city in the U.S. state of Texas and the seat of Rockwall County. [5] The U.S. Census Bureau estimates that as of the 2020 census, Rockwall's population is 47,251, up from 45,888 in 2019. [6] The name Rockwall is derived from a naturally jointed geological formation, which has the appearance of an artificial wall.

  7. Wide Area Telephone Service - Wikipedia

    en.wikipedia.org/wiki/Wide_Area_Telephone_Service

    Sheraton's 800‑325‑3535, one of the notable early adopters in late 1969, was hard-wired into St. Louis area code 314; [6] 1‑800‑HOLIDAY at that time could not be a U.S. number if the 1‑800‑465 prefix was hard-wired to Thunder Bay's area code 807. Any attempt to call a foreign 1‑800 gave a pre-recorded error, "the number you have ...

  8. Rockwall County, Texas - Wikipedia

    en.wikipedia.org/wiki/Rockwall_County,_Texas

    Rockwall County is a county in the U.S. state of Texas. At 149 square miles (390 sq km), Rockwall County has the smallest area of any Texas county. Per the 2020 Census, its population was 107,819. [1] Its county seat is Rockwall. [2] The county and city are named for a wall-like subterranean rock formation that runs throughout the county.

  9. DICOM - Wikipedia

    en.wikipedia.org/wiki/DICOM

    Digital Imaging and Communications in Medicine (DICOM) is a technical standard for the digital storage and transmission of medical images and related information. [1] It includes a file format definition, which specifies the structure of a DICOM file , as well as a network communication protocol that uses TCP/IP to communicate between systems.