Hey all,   Just purchased the iPhone 5C (White/32gb) from the AT&T store last night. Got it home and set up, when I felt something I hadn't in any of my previous iPhones (had a 3G and 4). Feels like something inside is loose. Whatever it is, it felt substantial (compared to the weight of the whole phone). I figure it is the battery.   I'm sitting in the Apple Store now waiting for a Genius Bar appointment to replace the phone with a "service part" (basically a new...