iPhone 3GS clone mic problem...can someone help?

It's a clone from china...3.5 inch screen with wifi and all...exact size...i bought it brand new just last 2 weeks but when i try to call someone, they couldn't hear me. i sent it for repair but the technician said the mic is not broken, it's true because i can record my voice with the record function in the phone. i suspect the problem is the firmware or software...but i know nothing about that. i heard there are phone codes i can input to enable the mic again....so my question is...anyone know about these codes....i've searched the net for these codes but none work on my phone...
 
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