My iPhone's lock screen button isn't behaving well and I'd like to take it to the Apple Store to get it replaced. I'm fairly certain I bought AppleCare on it, but the receipt and anything that might indicate I made that purchase are locked away in a storage locker and far from convenient to find.
Is there a way to determine if any piece of Apple hardware is currently under warranty or covered by an AppleCare plan without having the original purchase receipt?