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Learn about the history and current status of the three area codes for most of Manhattan in New York City. Find out how they are overlaid, how they are perceived, and how they are assigned to phone numbers.
Learn about the history and usage of telephone exchange names or central office names, which were assigned to switching systems in different localities. Find out how they were dialed, displayed, and replaced by numeric systems in various countries.
Find out the current and future area codes for different regions of New York state, including New York City, Long Island, and upstate New York. See the map, the year of assignment, and the overlays for each area code.
The North American Numbering Plan (NANP) is a telephone numbering system for twenty-five regions in twenty countries, mainly in North America and the Caribbean. It uses the country code 1 and divides the territories into numbering plan areas (NPAs) with three-digit area codes.
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.
The four largest cities, New York, Chicago, Philadelphia, and Boston, used seven digits. In New York, for example, "PENnsylvania 5000" became PEN-5000 and later PEnnsylvania 6-5000, dialled PE6-5000 or 736–5000). New York used the 3L-4N format from 1920, when dial telephones were first introduced there, until 1930, when it switched to 2L-5N.
Learn about the types, structures and formats of telephone numbers in different regions and networks. The International Telecommunication Union (ITU) has established a comprehensive numbering plan, E.164, for uniform interoperability of the networks of its member states or regional administrations.
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.