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Hi @michaelcheng511 . Do you get a ring tone when trying to call out?
Which phone option did you select with NBN? If $0 PAYG, you need to make a prepayment to make calls. Other options need prepayment for calls which are not included.
Moderators seem to be missing in action. You can try them in Facebook Messenger.
This link takes you straight to TPG's Facebook inbox : http://m.me/tpgtelecom