I have a noticeable hiss holding the back of the phone up to my ear and while on calls. Annoying to hear it while on a call. This video also has a similar hiss in it, but not quite as high pitch
I can't be certain but it might be the hiss bleeding through the video. I know there is some room noise there, but I've recorded 3 videos and each video has different hiss patterns. I have also had clicking noises when zooming in and when just using the various menus in iOS 10.
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