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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]
The French telephone numbering plan is used in Metropolitan France, French overseas departments and some overseas collectivities. Since 1996, Metropolitan France uses a ten-digit closed numbering plan , where the first two digits denote a geographic area, mobile or non-geographic number.
Telecommunications in France are highly developed. France is served by an extensive system of automatic telephone exchanges connected by modern networks of fiber-optic cable, coaxial cable, microwave radio relay, and a domestic satellite system; cellular telephone service is widely available, expanding rapidly, and includes roaming service to foreign countries.
This is a list of international dialing prefixes used in various countries for direct dialing of international telephone calls.These prefixes are typically required only when dialling from a landline, while in GSM-compliant mobile phone (cell phone) systems, the symbol + before the country code may be used irrespective of where the telephone is used at that moment; the network operator ...
Worldwide distribution of country calling codes. Regions are coloured by first digit. Telephone country codes, but also sometimes referred to as country dial-in codes, or historically international subscriber dialing (ISD) codes in the U.K., are telephone number dialing prefixes for reaching subscribers in foreign countries or areas via international telecommunication networks.
The world's first telephone exchange took place on Jan. 28, 1878. ... Coy published a list of New Haven's 50 phone subscribers (names of people and businesses only, as phone numbers didn't yet ...
I had an old french telephone directory and never in I read Pompadour (706, no exchange), Louvre (508, in fact GUtenberg) an Pigalle (744 in fact TRUdaine).Philippenusbaumer 17:50, 28 August 2010 (UTC) POMpadour, LOUvre, and PIGalle were certainly all valid Paris exchanges.
A telephone exchange is a telephone system for a small geographic area that provides the switching (interconnection) of subscriber lines for calls made between them. Telephone exchanges replaced small telephone systems that connected its users with direct lines between each and every subscriber station.