Hi. I have bought a Mi3 from my China trip and bought a Mi3 WCMDA. I'm able to use it in Turkey but there is strange problem about it. The phone finds network, it is ok. I can make calls but can not hear opponent from Mi3's speaker. When I switch it to handsfree mode or plug earphones, I can hear opponent. I thought there was a hardware problem on speaker. After a while, I recieved a call from Tango and "accidentaly" I answered and put it on my EAR. I WAS ABLE TO HEAR : ) Then, tried Viber. No problem. My problem is only on GSM mode. Any ideas?