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Does it sound like it is hitting something else? If yes, go to Apple and have them take a look.

If not, then it is probably supposed to be like that:p
 
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It's always the silent ringer switch :)
 
This has been covered a few times one here already. It's the autofocus camera. If you continuously tap the back of your phone with the camera app open, then touch the screen to focus on something, you can here it stop rattling for a second or two.
 
The problem has already been diagnosed. Read your own thread, please. We've done as much as we can through the interwebs.

How do you know that this is the problem though? I had a similar problem with my 3G, where I could hear something rattling inside, but only sometimes. It would cause the phone to randomly lock or turn the volume up/down. I got it replaced.

Perhaps it is just the camera, as I haven't played with a 3GS, and haven't been able to shake one, but you shouldn't say that it's nothing as a fact, as there could be something wrong.
 
How do you know that this is the problem though? I had a similar problem with my 3G, where I could hear something rattling inside, but only sometimes. It would cause the phone to randomly lock or turn the volume up/down. I got it replaced.

Perhaps it is just the camera, as I haven't played with a 3GS, and haven't been able to shake one, but you shouldn't say that it's nothing as a fact, as there could be something wrong.

As I said before. None of us here can physically touch the phone. We've given as much of a diagnosis as possible given the circumstance.
 
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