Why is there a pin size hole in the top of my cell phone

[Android Central Question]

Why is there a pin size hole in the top of my cell phone

 

[B. Diddy]

Welcome to Android Central! Which phone? That's most likely the secondary mic, which is used for noise cancellation when you're using the primary mic (at the bottom of the phone), as well as for speakerphone and for stereo recording.

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