Moved to Forum: Original Link
Not sure if anyone has noticed, basically if you leave your plan early you only need to pay off the remaining phone cost (if any). There are no ETF fees. Good if you don't like long term plan commitments.
From Optus:
If you need to leave your plan early you can. Simply pay out the full remaining cost of your phone including any amount Optus was going to cover.
Virgin Mobile has been like this for years; Optus followed suit a few months ago, now