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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]
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 ...
Alabama Telephone Company; All American Direct; American Cable and Radio Corporation; Ameritech; Andrew Corporation; AT&T Communications (1984–2010) AT&T Corporation; Atlantic and Pacific Telegraph Company; AT&T Broadband; Automatic Electric
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.
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 ...
The longest telephone numbers in use until now had been 9 digits long (not including the 0 trunk code), e.g. 051 234 5678, 0303 456789, 03873 56789, 0800 445566. The long term plan is for migration to 10 digit numbering in the UK and in 1991 this started with new 0800 numbers being allocated with 10 digits.
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.
20 March 1880: National Bell Telephone merges with others to form the American Bell Telephone Company. 1 April 1880: world's first wireless telephone call on Bell and Tainter's photophone (distant precursor to fiber-optic communications) from the Franklin School in Washington, D.C. to the window of Bell's laboratory, 213 meters away. [20] [21]