When making a cellular call the other person cannot hear me. FaceTime + Skype Work OK!

Hi Guys,
I have an iPhone 4 (non 'S') 16GB Black.
I have the most strangest problem I've ever had on iPhone (I've had every gen so far).
Here is the problem:
I make a standard cellular call and the other person is not able to hear me. If I make a FaceTime call though, the person can hear me no problem. I tried Skype too and that is OK also. So I know the microphone works, just not over cellular network.
I tried the sim in another iPhone I have access to. (iPhone 4S) and calls work fine on that one. So I know it's not a network issue.
I'm absolutely stumped by this issue.
I have tried the following:
Backing up my phone, entering DFU and re-setting back to factory, then restored from backup. It worked for a little while (maybe a week?) then the problem happened again.
I backed up my phone again and did the DFU reset but instead of restoring from backup, I ran with a vanilla phone for a while - this time it didn't last 2 days before it went silent again.
I have since DFU'd and Restored my phone 3 more times again but it has not cleared the issue this time - the problem is now constant it seems.
Over the past 3 months, I have restored, reset my phone to get rid of the problem many times, each time with different results. Sometimes it works for a while, other times it doesn't fix the problem.
It sounds hardware related but I keep coming back to the thought of "well if it works in FaceTime, it can't be hardware". But if it's not hardware, what is it?
Any help on this one is very much appreciated.
P.s. no, it's not muted

no setting need to be changed. you may try these steps http://support.apple.com/kb/ts5180

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Sorry about the delay, I have been away from my computer for a couple of days.
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