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Hi @rish-pr,
Have you checked if your device has VoLTE? You can check this link for reference: https://support.tpg.com.au/voice-over-lte-volte
Send us a private message and we'd be glad to assist.
-Ahra_G
Yes, @rish-pr
You will not be able to use the voice service of your TPG SIM, but the Data and Text messages should still work.