for dear all friends i have this problams i have i phone 4s when la call sumbody or sombody call me they cant hear me so i have put my phone on loud speaker this a big problam anybody can help dear all friends?
First thing to try is to reset your device. Press and hold the Home and Sleep buttons simultaneously ignoring the red slider should one appear until the Apple logo appears. Let go of the buttons and let the device restart. See if that fixes your problem.