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In the early 1980s, Bell Labs received a patent for what became AT&T's "Advanced 800 Service", a computer-controlled system where any toll-free number could point to any destination number, such as to a small business local number instead of a special InWATS line, and an itemized bill generated only for the calls the business actually received.
Free (1 to €1.6 if the subscriber wants to transfer their prepaid credit to the new carrier) The maximum time for the procedure is 24 working hours. In case of delay up to 3 working days no refund is given, if the delay is longer than 3 days user receive a refund of €2.5 for each day of delay, start counting from day 1.
The American Telephone & Telegraph Company (AT&T) first introduced 800 toll-free service in 1967. [2] When AT&T was the only Interexchange carrier, local exchange carriers automatically routed all toll-free calls directly to an AT&T point of presence without performing a translation from the toll-free number to the terminating telephone number. [3]
As CLASS was an AT&T trademark, the term vertical service code was adopted by the North American Numbering Plan Administration. The use of vertical is a somewhat dated reference to older switching methods and the fact that these services can only be accessed by a telephone subscriber, going up ( vertically ) inside the local central office ...
Local number portability (LNP) for fixed lines, and full mobile number portability (FMNP) for mobile phone lines, refers to the ability of a "customer of record" of an existing fixed-line or mobile telephone number assigned by a local exchange carrier (LEC) to reassign the number to another carrier ("service provider portability"), move it to another location ("geographic portability"), or ...
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.
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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 ...
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