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There are also free-phone numbers (starting with 0800 or 0508) that are given in the format 0800-AAA-AAA. It is not uncommon for the 0800 and 0508 to be enclosed in brackets, although this is not strictly correct as the brackets denote optional parts of the number, and the 0800 and 0508 is required. [6]
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]
A slash (/) with spaces on either side may be used to indicate alternative ending for numbers (i.e. "555 1234 / 4444" means 555 1234 and 555 4444). The non-dialable PBX (private branch exchange) extension number should be separated by words "extension" or "ext." in the national language after the phone number.
Users can switch carriers while keeping number and prefix (so prefixes are not tightly coupled to a specific carrier). If there is only 32.. followed by any other, shorter number, like 32 51 724859, this is the number of a normal phone, not a mobile. 46x: Join (discontinued mobile phone service provider) [3] 47x: Proximus (or other) 48x
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 different lengths. It shows which exchange the remaining numbers refer to. A full telephone number is usually ...
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In December 1930, New York City became the first city in the United States to adopt the two-letter and five-number format (2L-5N), which became the standard after World War II, when the Bell System administration designed the North American Numbering Plan to prepare the United States and Canada for Direct Distance Dialing (DDD), and began to ...
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