Iphone 4s microphone problem?

Ok so my wife has a Iphone 4s which seems to have a microphone.
when she makes or recevies call you are not able to hear her very well.
It sound as if she has her hand over the mic. She hasn't dropped it or had it in water or anything like that it just started do this.

I have replace the charging dock and microphone but this hasn't helped.

Can anyone please help

Well I had this problem when I had an iPhone 4S. You couldn't hear me at all but that was because some thing went inside the speaker and it broke. There isn't much you can do about it but just take it to the apple store, and say it stopped working for no reason and it's obviously bothering you. They should give you a new one, well that's what they did to me. Hope this helps.

I have the same problem.

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