My iPhone 4 speaker works when recording audio and in apps but when making a call, when i press the speaker button the other person can not hear me, it completely mutes. I just finished restoring the phone, i chose to set it up as a new phone and still has the problem. The speaker works, just not during calls. Any ideas? I have searched for this and found a lot of posts but none seem to have answers just a lot of people saying they have the problem also.