The trick with this is whether it is worth anything to have it "unlocked", if there are no better alternative providers. You're still going to need a data plan, no-one seems to do that on true pre-paid (30 days credit expiry isn't real pre-paid), and based on the assumption that I'd need to keep paying Optus for my service, I found that the Yes Cap 49 was the best deal for overall cost. That said, I only spend about $15 per month on Virgin Prepaid at the moment, so $61 per month for 24 months is still a big step up.