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

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

   The original 800-code operated for over thirty years before its 7.8 million possible numbers were depleted, but new toll-free area codes are being depleted at an increasing rate both by more widespread use of the numbers by voice-over-IP, pocket pagers, residential, and small business use, and response tracking for individual advertisements ...

4. 1-800-FREE-411 - Wikipedia

   en.wikipedia.org/wiki/1-800-FREE-411

   Callers dial 1-800 (888 or 866)-FREE411 [373-3411] from any phone in the United States to use the toll-free service. Sponsors cover part of the service cost by playing advertising messages during the call. Callers always hear an ad at the beginning of the call, and then another after they have made their request.

5. 30 Scam Phone Numbers To Block and Area Codes To Avoid - AOL

   www.aol.com/19-dangerous-scam-phone-numbers...

   877 numbers are toll-free numbers often used by businesses and organizations. They are generally considered reputable and legitimate. Caitlyn Moorhead and Cynthia Measom contributed to the ...

6. 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 ...

7. What You Need to Know About Phone Scams - AOL

   www.aol.com/know-phone-scams-180248742.html

   In addition, the company gives customers free Caller ID and one free second number called “PROXY” that you can give out like your junk email address to help keep your private number private ...