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Hi @songjh85,
Welcome to the Community!
The port out fee is being charged to cover the cost of porting process and call routing systems when you change provider. It is also included in our Standard Terms & conditions.
You may check the details further on our website under http://tpg.com.au/mobile -> Terms & Conditions -> Mobile Plan Brochure. If you port your mobile service number to another carrier a port out fee of $11 is payable.
Regards,
Ahra_G