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For example, a telephone number in North America consists of a three-digit area code, a three-digit central office code, and four digits for the line number. If the numbering plan area does not use an overlay plan with multiple area codes, or if the provider allows it for other technical reasons, seven-digit dialing may be permissible for calls ...
By 1900, the telegraph had become an integral part of American life, linking people and businesses across the country and around the world. In 1876, Alexander Graham Bell invented the telephone. After 1920 it replaced the telegraph as the primary means of communication between cities.
Cables usually bring a large number of drop wires from all over a district access network to one wire center or telephone exchange. When a telephone user wants to make a telephone call, equipment at the exchange examines the dialed telephone number and connects that telephone line to another in the same wire center, or to a trunk to a distant ...
In 1945, forty-five percent of American households had a telephone. [3] By 1957, that number had reached seventy-five percent, [4] and by 1970, over 90 percent. [3] In 2002, a majority of U.S. survey respondents reported having a mobile phone. [5] In January 2013, a majority of U.S. survey respondents reported owning a smartphone. [6]
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 most famous hotline between states is the Moscow–Washington hotline, also known as the "red telephone", although telephones have never been used in this capacity. This direct communications link was established on June 20, 1963, in the wake of the Cuban Missile Crisis , which convinced both sides of the need for better communications. [ 3 ]
In NANP telephone number specifications, the letter N represents a numeral from 2 through 9, while the letter X represents any numeral. Thus, NXX is a number from 200 through 999, while XXXX is a range from 0000 through 9999. The first three digits of a telephone number are the numbering plan area code (NPA code, or simply NPA).
For example, This US road sign reminds drivers and passengers about 5-1-1 service. 211: Community services and information; 311: Municipal government services, non-emergency number; 411: Directory assistance; 511: Traffic information or police non-emergency services; 611: Telephone company (telco) customer service and repair