I have iPhone 4 which is very nice in all the features but I have one problem with the calls. Whenever I try to make or receive any call from my phone I donít here the audio from other end and at the other end I am also not audible. This makes it a mute call. Sometimes Instead of that I can hear some crackling noise but 99% of time I cannot hear anything from that. I tried in all Normal phone modes, speaker phone, headset plugged in but none of them helped me. This is the new one then also .showing the problem Please tell be that what can be the possible reasons behind that and how can I solve that. Any help from anyone will be appreciative.