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Hi @CandyB, you have to have a sufficient prepaid balance in order to send SMS. Whilst receiving SMS while on roaming is free, sending SMS, using mobile data, and making/receiving calls will incur roaming charges. You can check the roaming rates at https://www.tpg.com.au/mobile#international-roaming
Also, here's how you can top up your prepaid balance: https://community.tpg.com.au/t5/Accounts-and-Billing/How-To-Top-Up-TPG-Mobile-Prepaid-Balance/td-p/1...
If you have a sufficient prepaid balance but still unable to send SMS, please send us a private message so we can take a closer look at your account.
Thanks,
Aubrey