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Area code 406
List of North American Numbering Plan area codes
List of municipalities in Montana
Area codes 916 and 279
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]
Area code 806
Toll-free telephone numbers in the North American ...
Telephone prefix