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AT&T continued to administer the continental numbering plan and the technical infrastructure until the end of the Bell System, when administration was delegated to the North American Numbering Plan Administrator (NANPA), a service that has been procured from the private sector by the Federal Communications Commission (FCC) in the United States.
The E.164 standard of the International Telecommunication Union is an international numbering plan and establishes a country calling code (country code) for each member organization. Country codes are prefixes to national telephone numbers that denote call routing to the network of a subordinate number plan administration, typically a country ...
In the United States, both interexchange carriers (IXCs) such as Sprint, AT&T Inc., and Verizon, and Local Exchange Carriers (LECs) such as Verizon and AT&T offer toll-free services. [2] [3] The way that a toll-free number is handled depends on whether it is a domestic or an interexchange call.
E.164 is an international standard (ITU-T Recommendation), titled The international public telecommunication numbering plan, that defines a numbering plan for the worldwide public switched telephone network (PSTN) and some other data networks. E.164 defines a general format for international telephone numbers.
AT&T was founded as Bell Telephone Company by Alexander Graham Bell, Thomas Watson and Gardiner Greene Hubbard after Bell's patenting of the telephone in 1875. [21] By 1881, Bell Telephone Company had become the American Bell Telephone Company. [22]
A trunk call is prefixed with '0' for national calls and '00' for international calls, following the European standard. It is now normal for local calls to cost the same as long-distance UK calls, and is now common, for a small extra monthly charge, to allow free calls to landlines within the UK.