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Each of the digits 2 to 9, and sometimes 0, corresponded to a group of typically three letters. The leading two or three letters of a telephone number indicated the exchange name, for example, EDgewood and IVanhoe, and were followed by 5 or 4 digits. The limitations that these systems presented in terms of usable names that were easy to ...
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 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 ...
The letters have also been used, mainly in the United States, as a technique for remembering telephone numbers easily. For example, an interior decorator might license the telephone number 1-800-724-6837, but advertise it as the more memorable phoneword "1-800-PAINTER". Sometimes businesses advertise a number with a mnemonic word having more ...
On 1 July 2009, telephone numbers in Karachi and Lahore were changed from seven digits to eight digits. This was accomplished by adding the digit "9" to the beginning of any phone number that started with a "9" (government and semi-government connections), and adding the digit "3" to any phone numbers that did not start with the number "9". [1]
Letters were assigned to each number from 2 to 0 on the telephone dial and a three-digit code, represented by letters, identified the local exchange. Telephone numbers were displayed preceded by the exchange name, with the first three letters highlighted to indicate the code, and number, such as WHItehall 1212.
Many telephone keypads have letters with the numbers, from which words can be formed. Sign in Argentina giving the number 0800 555 8736 as 0800 555 TREN. Phonewords are mnemonic phrases represented as alphanumeric equivalents of a telephone number. [1] In many countries, the digits on the telephone keypad also have letters
"Telephone and Internet Country Codes in 10 Languages". LincMad. "World Telephone Numbering Guide". World Telephone Number Guide. Archived from the original on 26 June 2019 "Phone calling codes of all countries with ISO3 and flags + phone codes of cities by countries"