Here is a summary of the format for Australian landline and mobile phone numbers.
|From within Australia, same area code||From within Australia, different area code||From outside Australia (international format)|
|Landline number||bbbb cccc||0a bbbb cccc||+61 a bbbb cccc|
|Mobile number||04mm ddd eee||04mm ddd eee||+61 4mm ddd eee|
Some mobile phones allow you to save phone numbers in your contacts in the local format, then they automatically add the required prefixes if you find yourself making a call from a different area code or from a different country. Some phones don’t do this and it causes problems. The easiest strategy is to always save phone numbers in your contacts in the international format (begins with the plus symbol). Your phone won’t need to be clever and it will always work.