IPhone 4 won't work when I call?

Since I installed iOS 7 my phone has been weird. When I call, I can hear the other end of the call but they can't hear me. Why is that? The mic on my phone is fine. It works perfectly. It has nothing to do with my service. I could have 5 bars and they still can't hear me. This problem never occurred until a few months ago. I've literally tried everything from power down power up to putting it on airplane mode for a few minutes and taking it off to resetting the network settings, but the problem still happens every time I call. Someone with knowledge of iPhones please help. It's becoming a huge problem and inconvenience.

I think you should power reset the iphone and see if it resolved the issue.

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