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Hi @Pollywade73,
Welcome to TPG Community!
If the iPrimus modem is not locked with them and it is NBN compatible, then you may try to use it, given that you can configure the device correctly with your TPG credentials.
VDSL configuration
VLAN ID = 2
PPPoE = TPG username and password
Should you require further assistance, please let us know.
BasilDV