My iPhone microphone is not working

A week ago my iPhone 4 microphone stoped to work. It just stoped, did not lose it in the ground or something, just stoped to work. When I call someone or if someone call me, they can't here me, but I can here them. But If I turn on speaker, they hear me normally.
Do you have any thoughts on how I can fix this?

IPhone microphone is not working

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