I can hear a slight lose part when I tap the back top of the iPhone 3GS?

I have the iPhone 3GS, gave my wife my old 3G. when I tap with my finger on the top of the 3GS up above the apple logo on the back I hear a slight rattle (or what seems to sound like a lose part inside the unit).
When I do the same tap my wife 3G it sound solid with no slight rattle inside?
Is it possible the compass component inside the phone or a different accelerometer Apple may of used (like a mercury switch) that may has a slight rattle?
I know this may seem trivial, but now I find myself tapping my phone and pondering if I have a lose part. The phone works great otherwise???
Thanks

Check the Ring/Silent switch above the volume rocker switch. It could be loose.
Message was edited by: dmiannay

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