You can't make a phone call with the xperia5 version of Au.

Operator network setup problem, SIM card problem.

1, operator network settings: I use the AU version of Xperia5, so I need to check the operator's network settings. You can try to contact your operator and ask if there are any network problems or restrictions that prevent you from making calls.

2.SIM card problem: If your SIM card has problems, such as damage or unsupported, you will not be able to make calls. You can try to insert the SIM card into another mobile phone or contact your own operator for help.