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Hi @Daniel4,
Please check and try the steps from this link: https://support.tpg.com.au/3g-network-closure-faq
Let us know how it goes.
-Ahra_G
Just curious which mobile you have.
I have(had) a Galaxy S5 and, according to my research, it would be fine running with 4G.
But it wasn't - It has 4G functions but doesn't support the voice part. Reference to the VoLTE of mobile phones. My mobile only had support for 'LTE' but not 'Vo' part and I could send and receive texts but not make or receive phone calls.
Find somewhere in your mobile settings (usually 'mobile networks' reference) and see if if does operate in 4G and does support 'VoLTE' - if it does then you may only need to turn it on in settings. If it doesn't support the 'VoLTE' or maybe the 'LTE' only (which my Galaxy S5) did, then you are up for a new mobile.
This is assuming you don't have a connection problem with TPG.
We're glad to know that it worked, @Daniel4! Sing out should you ever need any assistance. Cheers!