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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.

3. Virtual number - Wikipedia

   en.wikipedia.org/wiki/Virtual_number

   A virtual number is a telephone number that is not directly associated with a telephone line. It is used to forward incoming calls to one or more pre-set telephone numbers chosen by the client. Virtual numbers are often used for privacy reasons, as they allow users to keep their personal phone numbers private while still receiving calls.

4. Toll-free number portability - Wikipedia

   en.wikipedia.org/wiki/Toll-free_number_portability

   The system was redesigned in 1981 to use a database, the SMS/800 service management system, which could direct any toll-free number to any destination based on various conditions; number prefixes remained tied to specific carriers until a RespOrg (responsible organization) structure was introduced in 1993 (US) and 1994 (Canada) to allow ...

5. List of mobile virtual network operators in the United States

   en.wikipedia.org/wiki/List_of_mobile_virtual...

   Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the four major cellular carriers in the country—AT&T Mobility, Boost Mobile, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.

6. RespOrg - Wikipedia

   en.wikipedia.org/wiki/RespOrg

   A RespOrg, or responsible organization, is a company that maintains the registration for individual toll-free telephone numbers in the North American Numbering Plan by means of the distributed Service Management System/800 database.

7. 30 Scam Phone Numbers To Block and Area Codes To Avoid - AOL

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

   800-290-4726 more ways to reach us. Sign in. Mail. 24/7 Help. For premium support please call: ... 877 numbers are toll-free numbers often used by businesses and organizations. They are generally ...