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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]
North American Numbering Plan
List of North American Numbering Plan area codes
Telephone numbers in France
A telephone numbering plan is a type of numbering scheme used in telecommunication to assign telephone numbers to subscriber telephones or other telephony endpoints. [1] Telephone numbers are the addresses of participants in a telephone network, reachable by a system of destination code routing. Telephone numbering plans are defined in each of ...
0362 – Province of Monza – area of Seregno. 0363 – Provinces of Bergamo and Cremona. 0364 – Province of Brescia – areas of Valle Camonica and Breno. 0365 – Province of Brescia – Lake Garda and Valle Sabbia, area of Salò) 0371 – City and Province of Lodi and a few towns in the Metropolitan City of Milan.
National conventions for writing telephone numbers