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Hi @zhuxuanli . After 6 months, you keep paying month by month, but there are no termination fees. There is a small fee to port out your landline phone number, if you have one.
https://www.tpg.com.au/terms_conditions/tpg_voice
When porting your number out to another carrier, there may be charges payable to TPG for porting and other costs and obligations such as early termination fees and service and call charges that have not already been paid.