Currently Being ModeratedJul 24, 2013 12:07 PM (in response to wajeed_04)
Thanks for the question. I understand you are having issues with call audio. The following articles will provide the most relevant information for your issue:
It is also good to note that speakerphone utilizes a separate microphone on the iPhone 4S. If there was an issue with the regular microphone, you may still be able to use the "Top microphone" for speakerphone, FaceTime, etc.