Hmm.... While digging through all kinds of online info I accidentally stumbled upon apple unlocked iphones. That means your warrenty isnt void and you can upgrade without losing your unlock. All this can be found on the apple Austrailia website. It's like this because of laws there saying that a cell phone company can't impose the kinds of restrictions present in north america. You can buy a brand new iphone 3gs for A$ 945.45 which is fairly close to canadian dollars and $863.38 american. Thought you guys might be interested.