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Learn about the history and usage of fictitious telephone numbers in movies, music and other media. Find out why 555-555-5555 is not a valid number in North America and what are some examples of famous phone numbers.
555 is a central office code in the North American Numbering Plan, used for directory assistance and fictional numbers in media. Learn about its history, usage, and examples of 555 numbers in TV shows, films, and songs.
Area code 312 is a telephone area code for the city of Chicago, Illinois, in the North American Numbering Plan. It is an enclave area code, surrounded by area code 773, and has been overlaid by area code 872 since 2009.
A telephone directory is a listing of telephone subscribers in a geographical area or subscribers to services provided by the organization that publishes the directory. Learn about the history, types, and publication of telephone directories, and how they have changed with the Internet and smartphones.
Learn about the history and usage of 411, a telephone number for local directory assistance in Canada and the United States. Find out how 411 relates to long-distance dialing, 113, and other services in North America and Europe.
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]
A telephone number is a sequence of digits assigned to a device or subscriber for communication via the public switched telephone network or other networks. Learn about the history, formats, and functions of telephone numbers around the world.
Area code 872 is a telephone area code in the North American Numbering Plan for Chicago in Illinois. It is an overlay code for area codes 312 and 773, and was implemented in 2009 to cope with population and cell phone growth.