hi friends, i have s strange problem with iphone 3g 16gb. this phone's speakers work and gives out sound while playing songs,incoming call.and so on but i can not here the voice of speaking person on other side. i have replaced even the logic board with different iphone which works normal.and also i replaced the speaker system completely but it did not solve the problem. i have installed another version of IOS ,it did not solve also. if anyone can help on that issue i will be glad