I purchased an unlocked iPhone 4s from the Apple store Sunday. I switched it on vibrate for the first time today only to realize it doesn't sound as quit as my AT&T 4s did. It's loud and makes that camera rattle sound. This video on youtube is exactly how it sounds. http://www.youtube.com/watch?v=CBinBlxoCNA I even compared it to my sister's iPhone 4s and hers is much more quit and doesn't make this loud of a vibrate. It's really annoying when sitting on a desk. Long story short, I called the Apple store and made a Genius appointment for tomorrow night. The operator guy said they'll look at it and despite buying it two days ago, he couldn't guarantee I'd get a replacement. I'm hoping the genius rep acknowledges the phone vibrates "differently" or I'm SOL?