Lexi Webster
If you have an Australian mobile phone number, it will begin with the digits 04. This is the Australian national trunk code 0, followed by the mobile indicator 4. To convert this number into an international phone number, you would add a +61 before the 04, with the + symbol representing the international prefix, and 61 being Australia's country code.
| Characteristics | Values |
|---|---|
| Country Code | 61 |
| National Trunk Code | 0 |
| Mobile Indicator | 4 |
| Number of Digits | 10 |
| Format | 04XX XXX XXX or +61 4XX XXX XXX |
| Format for Landline | 2-digit area code followed by 8 digits |
| Format for Mobile | 4 digits, then 2 sets of 3 digits |
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What You'll Learn
Australian mobile number format
Australian mobile phone numbers have 10 digits. They begin with a 0, followed by a 4 to indicate that it is a mobile number, and then eight more digits. This is written as 04XX XXX XXX within Australia.
When writing mobile numbers, the standard format is to write the first four digits, followed by two chunks of three digits.
When written for an international audience, Australian mobile numbers are written as +61 4XX XXX XXX. The + symbol represents the international prefix, and 61 is the country code for Australia.
The Australian Communications and Media Authority (ACMA) defines and administers telephone numbers in Australia under the delegation of the Department of Infrastructure, Transport, Regional Development, Communications and the Arts.
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International format for Australian mobile numbers
Australian mobile phone numbers typically begin with the Australian national trunk code, 0, followed by the mobile indicator 4, and then eight digits. This is generally written as 04XX XXX XXX within Australia.
However, when writing Australian mobile numbers for an international audience, the format changes slightly. The international format for Australian mobile numbers is written as +61 4XX XXX XXX, with the plus sign '+' representing the international prefix, followed by the country code of 61 for Australia.
To break this down further, if your Australian mobile phone number is 04 123 456 789, you would write your international mobile number as +61 4 123 456 789. Here, the '+' at the beginning indicates that the correct international dial-out code has been used.
It is important to note that when dialling an Australian mobile number from overseas, you would need to include the international dial-out code of your country, such as 00 for the UK or 011 for the USA, before the Australian country code and the mobile number.
Additionally, when dialling an Australian mobile number from within Australia, you can simply dial the number starting with 04, without the need for any international or local area codes.
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Australian trunk code
Australia's trunk code is '''0'''. This is the same for both landline and mobile phone numbers.
When dialling a number in another area within Australia, you must dial the trunk code '0', followed by the area code, and then the local number. In major centres, the first four digits specify the CCA (Call Collection Area, also known as an exchange), and the remaining digits specify a number at that exchange.
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 these four areas have eight digits, consisting 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.
When calling 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'. In this context, the trunk code is typically incorporated into the area code domestically.
Mobile phone numbers in Australia begin with '04', which is the Australian national trunk code '0', plus the mobile indicator '4', followed by eight digits. This is generally written as '04XX XXX XXX' within Australia, or as '+61 4XX XXX XXX' for an international audience.
When dialling an Australian number from overseas, the country code for Australia, '61', is followed by the nine-digit national significant number. The '''+' symbol is used as an exit code when calling an international mobile number and is replaced with the caller's home country's international access code when dialling from a landline.
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Australian area codes
Australian mobile phone numbers are written as 10 digits when dialled within Australia, with the national trunk code "0" included, followed by "4", which indicates that the service is a mobile number. This is generally written as 04XX XXX XXX. When dialled from outside Australia, the "0" is omitted and replaced with the international country code for Australia, "61". Therefore, Australian mobile numbers are written as +61 4XX XXX XXX for an international audience.
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 these four areas have eight digits, consisting 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. When calling 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 trunk code is typically incorporated into the area code domestically.
When dialling from outside Australia, the appropriate international access code must be dialled first, followed by the country code for Australia, "61", and then 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 country code. Australian local telephone numbers have eight digits, conventionally written in the form xxxx xxxx.
The Australian Communications and Media Authority (ACMA) defines and administers telephone numbers in Australia under delegation by the Department of Infrastructure, Transport, Regional Development, Communications and the Arts, pursuant to the Telecommunications Numbering Plan 2025, enacted under subsection 455(1) of the Telecommunications Act 1997.
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Australian Communications and Media Authority (ACMA)
The Australian Communications and Media Authority (ACMA) is a government statutory authority within the Communications portfolio. It was formed on July 1, 2005, through the merger of the Australian Broadcasting Authority and the Australian Communications Authority.
ACMA is responsible for a wide range of functions, including monitoring the communications industry, handling complaints, maintaining registers, providing opinions, and conducting inspections, investigations, and inquiries. It also enforces rules by administering the application of industry codes and standards, applying sanctions and civil penalties, and issuing formal warnings for breaches of industry legislation. Additionally, ACMA is authorised to issue licenses and maintain applicable standards for licensees.
ACMA collects revenue on behalf of the Australian government through broadcasting, radio, and telecommunications taxes, charges, and license fees. It is also responsible for defining and administering telephone numbers in Australia under the Telecommunications Numbering Plan 2025, enacted under subsection 455(1) of the Telecommunications Act 1997.
For example, ACMA determines that Australian mobile phone numbers for international audiences should be written as +61 4XX XXX XXX, where 61 is the country code for Australia, and 4 is the mobile indicator. This format was introduced to clearly identify the owning telco before mobile number portability was implemented.
ACMA also works with industry and citizens to address concerns and mitigate risks in the evolving digital landscape, recognising that Australians interact with digital communications and content in changing ways.
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Frequently asked questions
Mobile numbers in Australia start with the prefix 04.
The international code for Australia is 61.
To call an Australian mobile number from outside Australia, you need to dial +61 4 followed by the rest of the number.
To call an Australian mobile number from within Australia, you need to dial 04 followed by the rest of the number.
