My iphone 5 is brand new, has never been dropped and it rattles?

Important question about iPhone 5, can anyone help?

So I got my iPhone 5 just right before Christmas. I absolutely love everything about it except one small thing. About two weeks ago, I noticed a small rattle when I tap the phone on the back near the camera or when I set it down. If I'm on a call and it vibrates, there's a small shake after the vibrate stops. I live overseas and do not have access to an Apple store right now. I've done a lot of research on this issue and gotten mixed answers. Some people go to the Genius Bar and get their phones replaced, and some get turned away with "it's normal, no need to worry". I don't know anyone that has a phone that rattle like mine. It's not a thud, as some people say is a result of a loose battery. Does anyone else have this issue? Have you gone to Apple? Did they replace it for you? And if I'm to go back to the states in August and go to an apple store, would they replace it, as the warranty would still have a few months till it would expire? I really need to get definitive detailed answers.

I've read various different physical problems regarding the iPhone 5 lately… Well, considering I'm with android I wouldn't know what to say to you about your misfortune, though I do own a macbook and know my way around an apple store. IMO I think you should maybe wait till you come to the US and then take it to the apple store to have it checked out. It does sound like a problem, but your warranty should cover it.

Pretty sure it is normal. My galaxy nexus, as well as my friends galaxy S3, and Droid Razr all do this.
it is the camera lense. Something about a floating lense or something. I would probably take it in just to be sure, but i wouldn't be surprised if the "geniuses" tell you the same thing.