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2. 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.

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

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

   800-290-4726 more ways to reach ... posed as buyers and requested a seller’s phone number and six-digit code to “verify the seller is real.” The scammers were likely using the phone numbers ...

4. Telephone number verification - Wikipedia

   en.wikipedia.org/wiki/Telephone_number_verification

   User being asked to dial a number or a send a message which helps the server identify that the number is genuine and valid. With the advent of smartphones, type 0 or type 1 SMS are also being employed to send the codes which are used to verify the genuine user. Soft tokens generated within the smartphone or push messages can also be used.

5. 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 ...

6. Scammers now using verification codes to hijack phone numbers

   www.aol.com/news/scammers-now-using-verification...

   A new scam tries to use your phone number to scam others, ... 800-290-4726 more ways to reach us. Mail. ... Scammers now using verification codes to hijack phone numbers.

7. Directory assistance - Wikipedia

   en.wikipedia.org/wiki/Directory_assistance

   A number offering a directory inquiries service allowing people to request to be put through to a mobile phone number was established in June 2009. [14] 118 800 proved to be controversial, however, when it was revealed that it was making available 15 million mobile numbers that it had bought from market researchers. [15]