try searchin redmondpie for it, but i don't think there is an unlock for it. It all depends on the baseband, and i'm 90% sure that the previous unlocking methods have all been patched by apple. your best bet is fido, and if not, picking up an unlocked iphone 4 from kijiji. let us know what happens/happened with fido, as i'm curious if they actually do it/charge $50 for it.
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