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Hi @0452295470
Welcome to the Community!
Your current plan does not include Internernational SMS therefore it will be Pay-as-you Go.
SMS to International Numbers is 50¢ per message (max 160 characters). You will need to top up your account to be able to send SMS (outside Australia).
Here's an article on how you can add a Prepaid Balance:
How to add Mobile Prepaid Balance
Regards,
Ahra_G