iPhone makes rattling noise when tapped

[Davewithak]

Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A334 Safari/7534.48.3)

When I tap or gently hit the iPhone 4S on the top front right (top left in the back), it makes a rattling noise like something is loose or shaking.

 

[readerbreader]

the slight rattle you hear near the camera, is the camera's autofocus. Or so i've been told

 

[MonkeySee....]

ahh good to know. I was going to call Apple. I didn't want a broken 4S