It is highly likely that you have had to make calls from especially noisy places more than once. In such cases, the interlocutor has almost worse than you: it is extremely difficult to recognize what you are saying through the noise of music or the crowd.
The iPhone has a hidden function for setting microphone modes. Works with Internet calls through any applications (Telegram, WhatsApp, Zoom, FaceTime, etc.). Unfortunately, this function is not supported in a regular telephone conversation.
The nuance is that the function is not located in ” Settings”. It appears directly during a call. You need to make a call in any of the applications, open “Control Center” (lower the curtain), tap on the microphone icon and select the mode “Voice Isolation”.
So the phone will start filter out extraneous noise so that the interlocutor hears your voice better. This is useful when talking outdoors or in noisy environments.