I have an Iphone 4 on the straight talk network. I am experiencing some indifferent sound quality when making phone calls. The people I am speaking to are complaining about low volume, muffled sound and not understanding everything I am saying. It was not previously like this on the same Iphone, therefore unsure what could be causing this to happen. The Iphone is in excellent condition. I have tried to restore the Iphone, but that does not seem to have done any good. Any ideas to solve this problem would be appreciated. Thanks
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