This wikiHow teaches you how to disable Noise Cancellation in your iPhone’s Accessibility settings, which can improve issues of fuzzy or muffled sound during calls.
Open your iPhone’s Settings. Settings is an app on one of your home screens that’s noted by a gray cog icon. If you don’t see it, look inside the Utilities folder.
Scroll down and tap General. It’s in the third group of options.
Tap Accessibility. You’ll see it in the third section.
Scroll down and slide the “Phone Noise Cancellation” switch to the off position. This switch is in the third section, under "Hearing." Noise cancellation is turned on by default in iOS 10. If turning off Noise Cancellation doesn’t improve the sound quality of your calls, there could be a problem with your earpiece. To contact Apple for assistance, see http://www.apple.com/contact/.
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