Using Iphone 4 IOS 5.1.1 jailbroken. When I call other people can't hear me. But when I plugged headset or I switch to speaker phone, they can hear me. With clear & loud voice.
Using voice recorder works fine.

I googling everywher, but there is no clear solution.

Is this problem related to software?
I just wondering, where can I control iphone microphone?
Or is there any addtional apps to control mic ?

Anybody can help me?

Thank you......