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Could you please confirm if you have a dial tone? If yes and you can still receive calls, then we may need to check the inclusions on your homephone add-on.
Checking your account, you have the OZ talk which include the following:
If you are trying to call International numbers or 13/1300 numbers, you may need to top-up your homephone.
Here's how: Home Phone Optional Prepaid Balance
For additional assistance, please don't hesitate to let us know.