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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, and 888.Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future.

3. 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 ...

4. RespOrg - Wikipedia

   en.wikipedia.org/wiki/RespOrg

   If the Service Management System were a central registry that controlled routing on all toll-free and other telephone numbers, the RespOrgs would be its registrars. Many RespOrgs are telephone companies or long-distance carriers; a toll-free number provided by a carrier is bundled with RespOrg service adequate to send all calls through that one ...

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

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

   888 numbers indicate it is a toll-free call. Calls made to toll-free numbers are paid for by the recipient rather than the caller, making them particularly popular among call centers and other ...

6. Toll-free telephone number - Wikipedia

   en.wikipedia.org/wiki/Toll-free_telephone_number

   A toll-free telephone number or freephone number is a telephone number that is billed for all arriving calls. For the calling party , a call to a toll-free number from a landline is free of charge. A toll-free number is identified by a dialing prefix similar to an area code .

7. Long-distance calling - Wikipedia

   en.wikipedia.org/wiki/Long-distance_calling

   By the 1980s, computerisation of the system allowed British Telecom "Linkline" 0800 freephone numbers and AT&T +1-800- toll-free numbers to be controlled by a database and terminated virtually anywhere with each inbound call itemised and billed individually. This smart network was further refined to provide toll-free number portability in the ...