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Users can switch carriers while keeping number and prefix (so prefixes are not tightly coupled to a specific carrier). 7 Claro 8: Instituto Costarricense de Electricidad (Kölbi) Croatia +385: 91: 9: A1 Hrvatska: Due to Mobile number portability the prefix of an existing number does not determine the carrier. Any new number will follow the ...
For example, 234 235-5678 is a valid telephone number; with area code 234, central office prefix (exchange) 235, and line number 5678. The number 234 911-5678 is invalid, because the central office code must not be in the form N11. 314 159-2653 is invalid, because the office code must not begin with 1.
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]
For example, individual extensions at Universität des Saarlandes can be dialed directly from outside via their four-digit internal extension +49-681-302-xxxx, whereas the university's official main number is +49-681-302-0 [8] (49 is the country code for Germany, 681 is the area code for Saarbrücken, 302 the prefix for the university).
As a matter of fact, each area code has only a limited number of prefixes assigned, and these are locally limited within the area. For example, the (0342) area has numbers with a 456- prefix, mostly located in the centre of Santa Fe. It also has numbers with a 460- prefix, usually for phone lines in the north east of the city.
This list contains the mobile country codes and mobile network codes for networks with country codes between 300 and 399, inclusively – a region that covers North America and the Caribbean. Guam and the Northern Mariana Islands are included in this region as parts of the United States.
The North American Numbering Plan is based on a ten-digit telephone number assigned to each telephone in the telephone network. The number is composed of the three-digit numbering plan area code, a three-digit central office code, and a four-digit station or line number. Certain rules govern the numerical format of each part.
OLD LIST OF MOBILE PREFIXES [1] NEW LIST OF MOBILE PREFIXES 2021 (Just use new prefix before old one) Prefix NSN length Operator Prefix NSN length Operator 01: 8 digits: Atlantic Telecom - Côte d'Ivoire 01 10 digits Atlantic Telecom - Côte d'Ivoire 02: 8 digits: Atlantic Telecom - Côte d'Ivoire 05 10 digits MTN – Côte d'Ivoire 03: 8 digits