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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...

   How Does a Reverse Phone Lookup Work? The company provides a service to look up the owner of any given number — whether it’s listed or unlisted.

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, and 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. Caller ID - Wikipedia

   en.wikipedia.org/wiki/Caller_ID

   For toll-free numbers, they may report a string such as TOLLFREE NUMBER if the name is not available in a database. Smartphones can use a third-party mobile app to do the name lookup in a third-party database.

5. Directory assistance - Wikipedia

   en.wikipedia.org/wiki/Directory_assistance

   Toll-free directory assistance was provided by telecommunication providers, namely AT&T and Verizon, as mandated by the Federal Communications Commission. Companies requested to have their toll-free number listed, and paid the providers each time their phone number was released to a toll-free directory-assistance caller.

6. Whitepages (company) - Wikipedia

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

   Whitepages is a provider of online directory services, fraud screening, background checks and identity verification for consumers and businesses. It has the largest database available of contact information on residents of the United States. [3] Whitepages was founded in 1997 as a hobby for then- Stanford student Alex Algard.

7. Line information database - Wikipedia

   en.wikipedia.org/wiki/Line_Information_DataBase

   The carrier performs a database lookup using the caller's telephone number to obtain the name information for the caller ID service. If the data is with another carrier, then the terminating carrier must perform a lookup and pay a small dip fee to the carrier hosting the information. [4]