The Australian telephone numbering plan governs the allocation of telephone numbers in Australia. It has changed many times, the most recent major reorganisation by the Australian Communications and Media Authority taking place between and For landline telephony, Australia is geographically divided into four areas, three of which cover more than one state or territory.
All local telephone numbers within the four areas have eight digits, consisting mainly of a four-digit exchange code and a four-digit local line number. The national significant number consists of a single-digit area code followed by the local eight-digit number, a total of nine digits. Calling within Australia a landline telephone in an area other than that of the caller, the telephone number is preceded by the Australian trunk prefix 0 and the area code: 0x xxxx xxxx.
The current numbering plan would appear to be sufficient to cope with potential increase in demand for services for quite some time to come. In addition, each other 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. Some numbers beginning with a 1 may be dialled without any replacement, after dialling the required international access code and the country code. Australian local numbers have eight digits, conventionally written in the form xxxx xxxx.
Mobile numbers are written in the form of ten digits, when dialed within Australia, the 0 must be included, and 4 , which indicates the service required is a mobile number. Mobile numbers are conventionally written 04xx xxx xxx. If a landline or mobile number is written where it may be viewed by an international audience e.
