By default, the iPhone uses noise reduction to reduce background noise during phone calls made through the phone app. Although noise reduction is good for most conversations, some people find it disorienting. If so, it̵7;s easy to turn it off completely. Here’s how.
What is telephone noise reduction?
Phone noise cancellation, first introduced in iOS 7, monitors the levels of ambient background noise and produces an inverse beep to interrupt background noise so you do not hear it during a phone call. The technology works best with continuous low-level background noise and usually works very well. But sometimes it can produce an incredibly quiet phone call or disturbing sound artifacts when dealing with unpredictable sounds, such as small audience sounds or background music at low levels.
Some people also find that the noise reduction effect is physically uncomfortable (similar to noise reduction headphone problems), especially when using a headset. Fortunately, the phone’s noise reduction is easy to turn off on iPhone with Settings.
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To turn off phone noise reduction on iPhone
First, open the settings on your iPhone.
Navigate to “Availability” in Settings.
Scroll down to the hearing section and press “Audio / Video”.
Press “Phone Noise Reduction” to turn it off.
You may want to go back one screen to make sure the change is detected. You can then exit Settings. The next time you make or receive a phone call, noise reduction will be disabled.