iPhone Microphone Not Working Isn’t Uncommon If your microphone stops working suddenly, your phone will become virtually unusable. A lot of actions you preformed on a mobile phone depend on the microphone: sending & receiving voice message, playing games, watching videos, calling others, participating in a voice meeting, etc. What is microphone? In fact, microphone (also known as mic) is an essential component of iPhone to convert sound into an electrical signal. How to Fix When People Can’t Hear Me on My iPhone.iPhone Microphone Not Working Isn’t Uncommon.It’s important to know the possible reasons for causing this and the corresponding methods for troubleshooting the problem. However, the iPhone microphone could stop working suddenly, preventing you from doing many things with the phone. It’s a natural thing to hear sound coming out from your iPhone when making phone calls, watching movies, or playing games.