How to Use Your Smartphone as a Mic on Windows

Windows does not offer a native feature to use a smartphone as a microphone, but you can use a third-party app like “WO Mic” to do the job.
Using the WO Mic app, the simplest way to turn your phone into a microphone for your PC is by connecting via Wi-Fi. This method works on both Android and iOS.
If Wi-Fi isn’t available, you can connect via Bluetooth or Wi-Fi Direct, but be aware that these choices are only available on the WO Mic Android app, not on iOS.