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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]
As phone lines became more popular—between 1942 and 1962, the number of phones in the U.S. grew 230% to 76 million—telephone companies realized they would run out of phone numbers.
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A telephone directory, commonly called a telephone book, telephone address book, phonebook, or the white and yellow pages, is a listing of telephone subscribers in a geographical area or subscribers to services provided by the organization that publishes the directory. Its purpose is to allow the telephone number of a subscriber identified by ...
In the following states and regions, the primary local carrier is not an RBOC: Lumen Technologies, in addition to its role as the BOC in the areas of 14 states gained from its acquisition of Qwest, Lumen serves other non-ex-Bell local exchanges in those states, as well as some in Florida and the Las Vegas metropolitan area in Nevada.
The series N00 was used later for non-geographic numbers, starting with intrastate toll-free 800 numbers for Inward Wide Area Telephone Service (WATS) in 1965. [17] N10 numbers became teletypewriter exchanges , [ 18 ] and N11 were used for special services, such as information and emergency services.
From the introduction of the telephone in the late 1870s, [5] to the early 1990s, telephone numbers in most of the United Kingdom were usually shown with a written exchange name followed by the subscriber number, e.g. 'Mallaig 10' or 'Aberdeen 43342'. This allowed calls to be placed initially through the operator and later by using local or ...
On a touch tone telephone, the codes are usually initiated with the star key, resulting in the commonly used name star codes. On rotary dial telephones, the star is replaced by dialing 11 . In North American telephony , VSCs were developed by the American Telephone and Telegraph Company (AT&T) as Custom Local Area Signaling Services ( CLASS or ...