The use of Microphone

Does anyone can summarize how many Microphone Iphone 4 has? How each of them are used?
From what I got from Apple tech support, there are two Mic, one on top and one on bottom:
Top one mainly for nosie canclellation.
Bottom one used for speak, recording etc.
But my problem is:
- I had no problem for Voice Memo, no problem for normal call (non-hand free), no problem for SKYPE, no problem for Tom Cat
- I DO has probelm for video capture(there is no sounds can be recorded), Can not make handfree call, Facetime (voice not working)
Any one has similiar problem or suggested solution?
** The phone has no liquid in, no droped. I just found it after I upgrade it to 5.0.1. ( I have no problem before)

This messages is helpful for this problem:
Digger Hole
Re: Microphone not working 2012-1-17 上午6:31 (in response to Dragonfrombj)
Hi Dragonfrombj,
I took my phone into the Apple Store and they replaced it for me.  Not only did this solve the microphone problem but everything else about the new phone seems to be faster and more instataneous and reliable than my original iPhone 4S.  It's clearly a better phone all round - even though it's supposed to be identical in every way.
I think I understand why your problem is different.....  When I was at the Apple store they tested my phone.  It seems that each iPhone 4S has 3 microphones (one in the bottom, one in the headset, plus another one on the top in a little hole next to the headphone socket)  They told me the one on the top was used for handsfree and Facetime etc.  If they are correct, then it would seem that your top microphone is broken or the little hole is blocked or there it a hair or a fibre stuck in it.
Please let us know how you get on.

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