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Caller can't hear me

jsm317

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Aug 7, 2011
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I bought an iphone 4 yesterday.

It's on 01.59.00 baseband, iOS 4.3.1 unlocked with ultrasn0w on tmobile prepaid.

The problem is when I call people, they can't hear me but I can hear them.

I can also send sms just fine. The phone picks up very good signal.

I tried recording my voice in voice memo and the microphone works.

Can you tell me how I can solve this problem? I've been googling but haven't found a solution yet.
 
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