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2. 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 mMail or answering machine .

3. Reverse telephone directory - Wikipedia

   en.wikipedia.org/wiki/Reverse_telephone_directory

   In United States, landline phone subscribers can pay a small fee to exclude their number from the directory, depending on the service provider. This service is available as an unlisted number, or an unpublished number. An unlisted number is excluded from public directories. An unpublished number is also excluded from directory assistance ...

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

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

   Open competition also brought an end to the pattern of long distance subsidizing local service, bringing per-minute charges down to levels where any business could afford to take orders using an 800-number. Originally, 800 service in the US and 800 service in Canada were isolated from each other, but in 1984, an agreement between carriers in ...

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

   www.aol.com/finance/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.

6. 6-1-1 - Wikipedia

   en.wikipedia.org/wiki/6-1-1

   Many landline and mobile phone providers support 611. Some providers who supply other services, such as Internet or cable television, support these other services with 611. While 611 has not been officially designated by the FCC, the code receives nearly 74 million calls annually, making it the most frequently used N11 number in the United ...

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.