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When a customer decides to use toll-free service, they assign a Responsible Organization (RespOrg) to own and maintain that number. The RespOrg can be either the IXC that is going to deliver the majority of the toll-free services or an independent RespOrg. [6] When a toll-free number is dialed, each digit is analyzed and processed by the LEC.
Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]
In Greece, the toll-free prefix is "800" followed by a seven-digit number or "807" followed by a four-digit number, used for phone card services only. In Hong Kong, toll-free numbers have the "800" prefix. [18] In Hungary, toll-free numbers have the "80" prefix. In Iceland, the toll-free prefix is "800", followed by a four-digit number.
System-wide toll-free calling, for which the receiving party is billed for the call, uses the number range with area codes of the form 8XX. Area code and central office prefixes for other non-geographic services have the form 5XX-NXX.
not in use; available for toll-free assignment: Codes 880 through 882 were used (until 1 April 2004) to allow international customers to access toll-free numbers they otherwise could not by paying the international portion of the toll. 880 was paired with 800, 881 with 888, and 882 with 877. [21] 888: toll-free telephone service: March 1, 1996 ...
When the current format was adopted in that year, existing toll-free numbers were given the format 01-800-0XX-XXXX. These numbers were advertised with the grouping 01-8000 -XX-XXX, leading many people to erroneously believe that the general prefix for toll-free numbers is 01-8000 .
For international access the NANP is assigned the country code 1, which is dialed as a prefix in the international E.164 telephone numbering plan. The trunk prefix for dialing long-distance calls, across numbering plan area (NPA) boundaries within Canada or to other NANP countries, is also 1.
Every toll-free telephone number is managed individually by a RespOrg. There are approximately 350 RespOrg services, [citation needed] ranging in size from large incumbent local exchange carriers (ILECs) to small companies that control only a few numbers. All RespOrgs operate under the same tariff and are required to follow specific guidelines ...