Can i use my phone in Australia

Stephen_2289888 Have you looked at the list of suggested articles at head of the page of posts?

You need to change settings on the phone first and then add a load of money to pay for all usage. Take a lookout the Price Guide for costs of International Roaming.

Possibly best to buy a local sim over there, or an e-sim if your phone accepts them. Also free wifi would allow you to call people on WhatsApp or similar.