iPhone 5 caller can hear me only low or bad

[cellulartalk]

I have an iPhone 5 (no bumper or case) and if i call somebody or he is calling me, he can here me in bad quality or low, but if i record with the voice recorder the quality is good. I changed the dock and microfone at the bottom, ...same thing. any advice?

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Courtesy of WestNet Wireless
www.westnet.ca