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What troubleshooting have you tried so far?
Check the troubleshooting here: https://support.tpg.com.au/troubleshooting-mobile-voice-no-coverage
Let us know how it goes.
Thank you @Syeo55
If you are still getting the No SIM error on another handset, then it may have become faulty.
We'd like to check on arranging a replacement for you. Just send us a private message with your account details.