Uses of Small Holes on Phones
Dual Microphone Noise Reduction
Most modern phones are equipped with two noise-canceling microphones:
One at the top (secondary)
One at the bottom (primary)
Together, they use what’s called dual microphone noise reduction technology. When environmental noise is detected, the system works to cancel it out—leaving just your voice. This results in crystal-clear call quality, regardless of your surroundings.
