Rattling sound near top of phone is normal?

[msaghirmd]

I initially thought it was the on/off button but I still hear the rattling sound when I hold the button. I can only hear the sound when shaking the phone a certain way and put it by ear. Shake in and out of plane of the horrible illustration I made.



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I--------------V---------I
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I ----------IPHONE-----I
I----------SCREEN------I
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[BlueKhufu]

Volume buttons?