call function or phone hardware is messed up

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http://forum.xda-developers.com – Yolo, My friend recently bought a galaxy note 2. He has this annoying problem like he's not able to hear or speak on a call. He even tried using the headset, he can hear when the call connects but automatically everything goes blank so at this point I think there something wrong with his phone software. So I suggested him to try using 3rd party phone app no luck there. Even a factory reset 3 or 4 times didn't work even flashed the firmware via odin nothing worked. Any suggestions like was there a similar problem for jelly in s3 or note. Is there a fix for this. Sent from my GT-N7100 using (HowTos)