Discover the critical function of the small hole in your smartphone. 

The small hole at the bottom of your smartphone is a secondary microphone. It plays a crucial role in noise reduction, ensuring your calls are clear by minimizing background noise.

This secondary microphone works in tandem with the primary one to capture and amplify your voice while filtering out environmental sounds.

This dual-microphone system significantly enhances call quality, making it possible to hear and be heard even in noisy surroundings.

Modern smartphones typically feature this noise-canceling technology, demonstrating the importance of even the smallest components in improving user experience.