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Just listened to a friends 4s in the same environment, has same issue. This is BAD. The issue is most people can't hear it.
 
Same issue here. I just noticed it on my 16gb black 4s. I haven't noticed it until today at work. I made several test calls from my desk phone and they all buzzed. My wife's phone call earlier in the day is what made me notice it.
 
Same Problem (Edited)

I have same problem too but only happens once in a while.So I'm not replacing my iPhone.
 
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This is really annoying, had mine for 6 months now and it's a horrible high pitched buzzing noise every time I call since I had it, makes me want to end the call every time. It's a great phone for everything other than why it exists in the first place, telephone calls.

Now you may be wondering why I still have it after 6 months in that state. I live in Belgium and bought it from my ISP and they have third party to deliver the Iphones and I called them and they said they would have to send it away for minimum one month!! This I find outrageous. So will have to buy the 5 and then I can send it for repairs. Not good Apple.

Don't suppose there is a simple fix for this?

This is the noise - just found a clip:

http://www.youtube.com/watch?v=Bf0r1QRW8q4
 
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