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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]
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Worldwide distribution of country calling codes. Regions are coloured by first digit. Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.
Mobile phone numbers have a total of 10 to 12 digits for postpaid depending on the operator, whereas prepaid services get 11 to 13 digits determined by the operator. Until October 1999, East Timor was included in the Indonesian telephone numbering plan, using the area codes 0390 (for Dili ) [ 1 ] and 0399 (for Baucau ).
A telephone prefix is the first set of digits after the country, and area codes of a telephone number. In the North American Numbering Plan countries (country code 1), it is the first three digits of a seven-digit local phone number, the second three digits of the 3-3-4 scheme. In other countries, both the prefix and the number may have ...
Land line phone numbers in Kenya follow the format Area Code + Phone Number. To dial a number within an area or city, only the phone number needs to be dialled. When dialling from a different area or city, the telephone number is dialled in the format 0 + Area Code + Phone Number. When dialling from abroad, the 0 is omitted.
For mobile phones, since there is number portability, the mobile phone code only indicates the original operator. For example, when a person calls a number starting with 73 ( T-Mobile ) but had been ported to another operator, a short voice message in Czech and English is played stating "you are calling out of a T-Mobile network" before the ...
The country's country calling code is +966. Saudi Arabia's numbering plan is the following: [1] 011 XXX XXXX - Riyadh & the greater central region; 012 XXX XXXX - Western region, includes Makkah, Jeddah, Taif, Rabigh