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2. Directory assistance - Wikipedia

   en.wikipedia.org/wiki/Directory_assistance

   In the U.S., directory assistance for companies with toll-free "800 numbers" (with area codes 800, 833, 844, 855, 866, 877, and 888) was available from toll-free directory assistance, reachable by dialing 1-800-555-1212, for many decades until it was discontinued in 2020.

3. 411 (telephone number) - Wikipedia

   en.wikipedia.org/wiki/411_(telephone_number)

   Direct-distance dialing (DDD) was first introduced in areas with common-control switching (panel and crossbar) in the 1950s.These areas had used 411 for directory assistance, and because of the ability of common-control switching to analyze the initial digits of a number in a "sender" before routing the call, these areas did not require the dialing of an initial 1 to initiate a long-distance call.

4. 1-800-FREE-411 - Wikipedia

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

   1-800-FREE-411 is an American service offering advertising-supported directory assistance, operated by Marchex. Service. Callers dial 1-800 (888 or 866) ...

5. 555 (telephone number) - Wikipedia

   en.wikipedia.org/wiki/555_(telephone_number)

   As of September 2016, all 555 numbers have been returned to the NANPA inventory except 555-1212 (national use directory assistance) and 555-4334 (national use assigned). [ 3 ] In 1996, Canadian telephone companies began promoting 555-1313 as "name that number", a pay-per-use reverse lookup which would give a subscriber name if the user entered ...

6. 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.

7. N11 code - Wikipedia

   en.wikipedia.org/wiki/N11_code

   411: Directory assistance; 511: Traffic information or police non-emergency services; 611: Telephone company (telco) customer service and repair; 711: TDD and Relay Services for the deaf and hard of hearing; 811: Underground public utility location (United States); [3] non-emergency health information and services (Canada)