How to send short messages to Australia?

If your friend's Australian mobile phone number is 04 12 345 678.

You can send a message to 006 1 4 12 345 678.

Or send to +6 1 4 12 345 678.

But don't forget to go to your mobile phone to confirm whether your mobile phone has international SMS service. If there is no extra charge, one counts as one. 1, 1.