Former Australian dialling codes0055 numbers were previously premium-rate numbers, but have been moved into 190 numbers before 1999. They are still referenced by many Australians. 013 was previously the directory assistance number, which has been moved to 1223 , 1234 and 12456 . 014 was originally the number for the time, which later was changed to 1104 , and more recently 1194 . Until the early 1960s, the first one or two digits of telephone numbers in metropolitan areas were alphabetical, with each letter representing a distinct number on the telephone dial. Each one-letter or two-letter code signified an exchange within an urban area. Rural and regional areas typically relied on manual exchanges, or only one automatic exchange for the whole town, so rural and regional numbers did not feature these letter prefixes. This alphanumeric scheme was significantly different to the current system used for SMS messages. The former alphanumeric scheme was: A = 1; B = 2; F = 3; J = 4; L = 5; M = 6; U = 7; W = 8; X = 9; Y = 0 The old call back number was 199, and could be used on public pay phones, and private numbers too. This has been moved to newer numbers.