The initial action is to check the iPhone mic. Try making a few movies and testing all three microphones before assuming you need to take your smartphone to a service center.

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In an iPhone 8, you will find 3 microphones. They can be found on the phone’s top, bottom, and backside.

For phone calls, this microphone is used. Some people mix up the speaker grills with the microphone, but your iPhone 8’s speaker is on the bottom right side.

Video calls, Siri, speech recording with the Voice Memos app, and phone calls all use this microphone. It’s near the top of your iPhone, roughly where your ear would be if you held it in portrait mode normally.

If you have a black iPhone 8, the camera may be nearly undetectable because it merges in with the phone’s body. In any other color, though, it is easily obvious.

This microphone is used to record video and take pictures with the rear camera. It’s right next to the camera on the backside of your iPhone, so you won’t notice it unless someone takes a picture of your phone from behind!

So now you know where each of these mics on the iPhone 8 may be found. 

Microscopic dust particles may be causing the vocal output to be muted. Taking apart an iPhone is difficult and not suggested if you have no prior experience, yet it would be really helpful in cleaning up the grime within the smartphone.

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