Random question... Mate lost his iPhone at work, got a replacement, then the old one turned up a few weeks later a bit battered with the screen in bits.

I'm guessing they block the IMEI of the old phone and send out a replacement... Any idea if he took the old one to an Apple shop after getting a Genius appointment whether he could pay the out of warranty charge and get a new phone that works (If the old one was IMEI blocked?).