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2. Toll-free telephone numbers in the North American Numbering ...

   en.wikipedia.org/wiki/Toll-free_telephone...

   A RespOrg system was implemented in 1993 to provide toll-free number portability between rival carriers using the SMS/800 database. Open competition also brought an end to the pattern of long distance subsidizing local service, bringing per-minute charges down to levels where any business could afford to take orders using an 800-number.

3. 10-10-321 - Wikipedia

   en.wikipedia.org/wiki/10-10-321

   10-10-321, 10-10-345, 10-10-220, and 10-10-987 are United States long-distance phone services best known for their prolific television and direct mail advertising in the late 1990s. 10-10-321 was the first mass-marketed service of its type. 10-10-345 was owned by AT&T, and the rest were all owned by MCI, which is now part of Verizon.

4. Long-distance calling - Wikipedia

   en.wikipedia.org/wiki/Long-distance_calling

   Interstate long-distance or inter-LATA interstate long-distance, the most common group, is the one for which long-distance carriers are usually chosen by telephone customers. Another form of long-distance call, increasingly relevant to more U.S. states, is known as an inter-LATA intrastate long-distance call. This refers to a calling area ...

5. 411 (telephone number) - Wikipedia

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

   When long-distance numbers were needed, prior to the full introduction of direct-dialed long-distance service, callers would call either 411 or 0 and request a free long-distance connection to the directory assistance center in the distant city. In 1962, direct-dialed long-distance directory assistance became available.

6. Toll-free telephone number - Wikipedia

   en.wikipedia.org/wiki/Toll-free_telephone_number

   In India, the toll-free prefix is "1800", followed by a six or seven digit number. They are free of charge if called from a mobile phone or a land line. The "1860" prefix followed by seven digits is used for local-rate numbers. The calling party pays the local rate and the called party pays long-distance call charges (if any).

7. Wide Area Telephone Service - Wikipedia

   en.wikipedia.org/wiki/Wide_Area_Telephone_Service

   WATS was introduced by the Bell System in 1961 as a long-distance flat-rate plan by which a business could obtain a special line with an included number of hours ('measured time' or 'full-time') of long-distance calling to a specified area. [2] [3] These lines were most often connected to private branch exchanges in large businesses.

8. North American Numbering Plan - Wikipedia

   en.wikipedia.org/wiki/North_American_Numbering_Plan

   It was once common to reserve entire unused exchange prefixes or N11 numbers (4101 was ringback number on many step-by-step switches), but these have largely moved to individual unpublished numbers within the standard 958-xxxx (local) or 959-xxxx (long-distance) plant test exchanges as numbers become scarce.

9. Blue box - Wikipedia

   en.wikipedia.org/wiki/Blue_box

   To address this need, the Bell System adopted a second system on the circuits that connected the exchanges. When the user dialed a long-distance number, indicated in North America by dialing a "1" at the beginning of the number, the call was switched to a separate system known as a "tandem".