The small round hole on the phone is actually a secondary microphone, which plays an important role in the dual microphone system that helps reduce noise. This is a noise-canceling microphone, which is integrated into most modern smartphones. Thanks to this microphone, your calls will be clearer and of better quality. Without it, your voice will not be transmitted clearly to the listener.

Even if there is a lot of noise around, you can still hear and transmit your voice clearly thanks to this small hole. Placing the microphone at the bottom of the phone close to your mouth helps your voice to be better captured and transmitted, improving the quality of the call.
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