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Face of a 1939 rotary dial showing a 2L-4N style alphanumeric telephone number LA-2697 2008 photo shows a hairdressing shop in Toronto with an exterior sign showing the shop's telephone number in the old two-letters plus five-digits format.
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]
Telephone dial number card of c.1948 with the local telephone number 4-5876 in Atlantic City, NJ, using the central office prefix 4, later converted to AT4 Face of a 1939 rotary telephone dial with the telephone number LA-2697, which includes the first two letters of Lakewood, New Jersey, as the central office prefix, later converted to LA6.
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.
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]
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 assigned.