General phone calling problem, other person cant hear me

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http://androidforums.com – After looking around I see that this is a common problem with the samsung s3. I've done everything suggested... turned off noise reduction in call settings, made sure mute isn't on. its definitely not a problem with my internal mic. Whether i make the call or receive the call, the other person cannot hear me. if i use speakerphone or my earphones then the person can hear me. if i try to have a conversation using just my phone, they cannot hear. my firmware is up to date, mic problems is ruled out, done every suggested fix available and still no joy. this is REALLY FRUSTRATING ME. especially as (General)