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  2. Telephone number verification - Wikipedia

    en.wikipedia.org/wiki/Telephone_number_verification

    A JavaScript function can check to see if a phone number is a valid format, i.e., is numeric, starts with a valid set of numbers ("0" for local, or an international dialing prefix followed by a valid country code) and is not too short to be a phone number. At first a JavaScript function is used to clear out any spacer characters.

  3. NumberGuru - Wikipedia

    en.wikipedia.org/wiki/NumberGuru

    It was also listed as a Top 10 Utility App and Top 150 Free Apps Overall by App Annie. [5] NumberGuru works by entering the telephone number that the user wishes to find information on. The owner's name, phone carrier, location, and type of phone are returned in the results. [6]

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

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

    There’s an easy way to find out: conduct a reverse phone lookup — for free. But is there a truly free reverse phone lookup? Yes — there are plenty of sites that offer free reverse phone lookups.

  5. Automatic number identification - Wikipedia

    en.wikipedia.org/wiki/Automatic_number...

    Dialed Number Identification Service (DNIS) is a related service feature available to private branch exchange subscribers. [7] [8] It transmits information about the destination number, which a service provider can use to have several toll-free numbers directed to the same call center and provide unique service. DNIS can also be used to ...

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

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

    Some are not accessible from pay phones. Calls from pay phones assess the toll-free owner an additional fee in the U.S., as mandated by the FCC. Although toll-free numbers are not accessible internationally, many phone services actually call through the U.S., and in this case the toll-free numbers become available.

  7. What's a six-digit verification code — and why you should ...

    www.aol.com/whats-six-digit-verification-code...

    Use a phone number you trust, such as the number on a past statement or a verified number from your phone's address book. Beware of unsolicited messages claiming something’s wrong with your account.