Unlocking iPhone 4 in Sydney?

I need to get my iPhone 4 unlocked and currently in Sydney, Australia. Does anyone know where a reputable place to go is to get it unlocked from O2?

The cheapest and easiest way will be to get your iPhone factory unlocked remotely at one of the known online vendors like http://www.cellfservices.com. Should take only a couple of days for O2.

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