A friend who was on holiday in Turkey was refused a new iphone battery (she was willing to pay for it) at the official Apple store as it was not locally bought (she bought it in SF). So no global warranty, but also no global repair or replacement of parts with official parts even when you are willing to pay for it.
[1] I was in the Philippines and I was getting off a boat in shallow sea water. My phone was in the bottom pocket of my beach shorts, and I walked through the sea water for maybe two to three metres distance up to waist height depth. This should have been ok for the depth I went.
Their suspicion was that the outer seal had failed (even though it had always been in a case).