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オリジナル投稿者: martin ,

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When recording, your speaker turns into a microphone as well to boost the overall quality and sound of the recording. However when you make a phone call, this option is disabled and the top microphone (right next to the earphone jack) is used for this purpose.

If i were you i would check the iPhone's limited warranty to see if you are still covered, and if so contact apple to organise a free replacement. If you aren't then you will have to do some extensive testing with various parts to diagnose the problem.

Hope this helps :D

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