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Telephone prefix
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]
List of country calling codes
List of North American Numbering Plan area codes
List of mobile telephone prefixes by country
List of international call prefixes
Telephone numbers in France
Area codes 214, 469, 972, and 945