Telephone numbers in Australia plan (including the "Trunk Access Code"), presented in domestic format. (Geographical region boundaries do not exactly follow State borders.) The current numbering plan would appear to be sufficient to cope with potential increase in demand for services for quite some time to come. The 06 and 09 area codes are completely unused. In addition, each current area code has large number "ranges" unallocated. When dialling from outside Australia, after dialling the appropriate International Access Code it is necessary to dial the Country Code for Australia (61) followed by the nine digit "National 'Significant' Number". (The + symbol is used to
Subscriber trunk dialling name on the telephone dial, with the exception of London which had the two-digit code 01. Codes were later changed (e.g., London became 020, and Manchester 0161). Until 1992, calls to these cities from Ireland required the following codes: In that year, this changed to dialling in the international format , and the 03 range was withdrawn from use. Subscriber trunk dialling Subscriber trunk dialling (STD, also known as subscriber toll dialling) is a telephone system allowing subscribers to dial trunk calls without operator assistance. The term was introduced when it first became possible for long-distance calls to be dialled