Welcome back to the forums, and thank you for asking.
The standard price for calling an Australia landline is 44.93p per minute, and mobiles are 81.7p. However there are ways of making the calls cheaper if you call these numbers regularly. You could sign up to one of our Talk International talk plans - for a small additional monthly charge, you do get major savings on calls abroad.
For a full breakdown of costs why not check out our Every day call charges (Australia is on page 8), this will give you all the costs from the different Talk International plans that we offer.