Other people can't hear me while calling...?

haseebbutt10

Distinguished
Apr 13, 2010
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Idk what's the problem but when I call other people using SIM, they say that they can't hear me while other apps which involve sound work fine, even the voice recorder... And when I call using yahoo messenger, it still works fine...
What's the problem? Please help!
I'm running iOS 4.2.1 on iPhone 4.
 
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