Hi, just to clarify, do you mean you can't receive international messages on your Globe SIM? If you are on postpaid, it should automatically be on roaming pagdating mo Australia but if you are on prepaid, kailangan na-activate mo na yung roaming mo before departing.
But if your roaming's ok naman, I suppose it might be affected by several factors:
3) roaming service activation
4) available balance/credit
5) operator restrictions (not sure but can be a possibility)
6) type of message you are sending (SMS, MMS, IM)
Why i cant receive texts sms from philippines?