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  2. How to Do a Free Reverse Phone Lookup & the 8 Best ... - AOL

    www.aol.com/free-reverse-phone-lookup-8...

    Spy Dialer is a free reverse phone lookup service that accesses public databases of registered phone numbers to help users find information on cell phone and landline numbers and emails.

  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 have the area code prefix 800, 833, 844, 855, 866, 877, or 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.

  4. Whitepages (company) - Wikipedia

    en.wikipedia.org/wiki/Whitepages_(company)

    [5] [13] By 2008 the company had $66 million in annual revenues. [8] In 2008, Whitepages said it would start working on options for users to control their information on the site. [14] That same year, it acquired VoIP developer Snapvine [10] in order to add features where users could be called through the website without giving out their phone ...

  5. Telephone number verification - Wikipedia

    en.wikipedia.org/wiki/Telephone_number_verification

    Telephone number verification (or validation) services are online services used to establish whether a given telephone number is in service. They may include a form of Turing test to further determine if a human answers or answering equipment such as a modem , fax , voice mail or answering machine .

  6. North American Numbering Plan - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering_Plan

    The network reorganization standardized this system to using a two-letter and five-digit (2L-5N or 2-5) representation of telephone numbers in most exchanges in North America, [32] or to using an equivalent all-numeric seven-digit numbering plan, as was practiced by some independent telephone companies.

  7. Directory assistance - Wikipedia

    en.wikipedia.org/wiki/Directory_assistance

    OSIS accepts updates from telecoms providers seven days a week, and supplies that information to the inquiry companies six days a week. [5] As of 2017, there were over 200 providers. [6] 118 118 (The Number) was the second most-expensive number at £11.23 for a 90-second call, but accounted for 40% of DQ calls, [4] mostly due to heavy ...