The home button stopped working completely when I was in Shanghai last month, the Apple store there could not honor any warranty repair or replacement since it's a USA phone locked to AT&T. Somehow the issue magically solved itself. I went to the Apple store in Manhattan this afternoon, just to try my luck, I did not expect them do anything since it works fine right now. Talked to a Genius, showed him the work sheet for the Shanghai store, it confirms the home button not working but warranty rejected. The guy was nice enough to give me a replacement right on the spot. Now, I asked if it's a new or refurb phone, he said he would not know. I recall a post here saying a 5k serial number indicates refurb phone. The replacement phone I got, the serial # starts with 6111. Is it new or refurb?