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Hi @0473837777,
Welcome to the community!
We did an article that you may find helpful, this will guide you on how to activate your SIM card.
See link below.
How to activate your TPG Mobile SIM card
Should you need further assistance, feel free to search community for help or chat with us at https://www.tpg.com.au/support/contact/ and we'd be glad to assist you.
Regards,