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As phone lines became more popular—between 1942 and 1962, the number of phones in the U.S. grew 230% to 76 million—telephone companies realized they would run out of phone numbers.
Telephone numbers were first used in 1879 in Lowell, Massachusetts, when they replaced the request for subscriber names by callers connecting to the switchboard operator. [2] Over the course of telephone history, telephone numbers had various lengths and formats and even included most letters of the alphabet in leading positions when telephone ...
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 mobile phone keypad with Latin and Japanese characters. In the course of telephone history, dials as well as keypads have been associated with various mappings of letters and characters to numbers. The system used in Denmark [failed verification] was different from that used in the UK, which, in turn, was different from the US and Australia. [10]
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]
Two-digit numbers were sufficient on small exchanges with fewer than 100 subscribers, while exchanges with a few hundred lines used three-digit subscriber numbers, e.g. 200–499. Larger exchanges which covered thousands of lines used four-digit subscriber numbers, e.g. 2000–5999, or five-digit subscriber numbers, e.g. 20000–49999.
Convert a year to two digits with zero padding, but years ending in 00 are returned with all digits and no leading zeros. Tests 1999 -> 99 2000 -> 2000 2001 -> 01 See also. Template:Two-digit year. Will also convert years ending in 00.
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