Many people still don’t know what this little hole is for

Sound waves pass through this microphone and are amplified, allowing the listener on the other end to receive clearer sound. Without the secondary microphone, call quality would be significantly reduced.

Most cell phones today have two noise-reducing microphones, one on top and one on the bottom. When the phone is affected by ambient noise, the secondary microphone reduces that noise, leaving only the sound of the call. This technology, known as “dual-microphone noise reduction,” makes calls clearer even in noisy environments.