Ditto, used SAMPrefs to deactivate, hook up to iTunes, and "Congratulations, your iPhone is unlocked!".How are you unlocking them? The one I did is actually "official" through iTunes when all is said and done, and more importantly- permanent.
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EDIT: Sorry, my last post might be misleading, I was HELPING a friend unlock them via Chronic Unlocks, I don't do them myself.