Mobile phone numbers begin with 04, followed by eight digits. e.g. 04yy yxx xxx. The y-digit codes are allocated per network, although with the introduction of number portability, there is no longer a fixed relationship between the mobile phone number and the network it uses. New numbers are still allocated to phone companies in blocks, so a new number will generally still be on its "home" network.

Within Australia, mobile numbers must always be dialed with all 10 digits, no matter where they are being called from. 04 is a prefix, not an "area code", as such.

 

Area Code 0423 Details and Prefixes
General Details about Area Code 0423
Country Australia
Capital City Canberra
Time Zone UTC+08:00 - UTC+10:00
Phone Type Mobile

Area Code 0423 Prefixes

Prefix Mobile Phone Company
0423653 Optus
0423147 Optus
0423770 Optus
0423485 Optus
0423819 Optus
0423074 Optus
0423390 Optus
0423474 Optus
0423240 Optus
0423110 Optus
0423048 Optus
0423659 Optus
0423492 Optus
0423934 Optus
0423515 Optus
0423309 Optus
0423937 Optus
0423084 Optus
0423029 Optus
0423780 Optus
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