My iPhone suddenly has a very dark backscreen. The water sensor is still white so I am assuming no water damage although inside my "skin" it was damp. Haven't figured out how that happened yet as it was in my purse and nothing was soaked. I have reset it, restored it and alas, screen is still dark. I can use it but its just hard to see Any suggestions? I just renewed my protection plan last week (so random) and haven't received it yet to register it again. Should I wait to register it and then take my phone in as I don't think this is a water issue? Help!