Hi there guys, I have searched for these kinds of threads but I only found some specific problem threads. I'm under warranty until February 2014 and I'm preparing about this because one of my friends' iPhone started to swell on the back and got it replaced free.. 1. In what condition(s) can I get my iPhone replaced for free? (for example swelling battery because of defects?) 2. If I have dents and scuffs everything on the iPhone with a defect battery for instance, will they still replace it? 3. How long would it take to replace the iPhone? I'm looking forward to the answers. Thanks!