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I tried to reply to a message from overseas and it says can't send try again Error 0 then I tried to send an SMS within Aus. and it worked
Welcome to the Community!
Did you check if you have enough credit or prepaid balance to be able to send out SMS overseas?
The SMS to international mobile is 50c per message (max 160 characters).
If you don't have enough balance, please add some funds in the TPG My Account.
Let us know if you need further assistance.