michaelmurfy:
How I see it is you've got over 2yrs use out of an iPhone - just call it as a chance to move on and sell the phone on Trademe.
You won't get much on trademe if it has a fault. You can buy an iphone 4 new/refurbished for about $299, so you would be lucky to get $150 for one where wifi isn't working.
As we pay more for goods in NZ to get CGA protection, it is a process you can take.