On your iPhone you may see red microphone icon on top left side bar of your screen and remove camera and lock icon from lock screen as well and also you can see blue light and orange light also. If you are seeing red microphone icon then by turning off permissions in privacy settings app and see which app is causing red microphone app to appear on top of microphone.
Red or dot Microphone icon indicates that certain app is running in the background and that app is using the microphone. So , close all the apps running in the background and check whether microphone is gone or not.
You need to disable permissions for the app which is triggering red microphone icon to disappear on your screen.
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You can also see the same red microphone icon which means you have granted access to record voice functions like, using voice commands when searching something on google or it can be anything.
Red microphone icon appears when you switch one app from other which previously used microphone and you haven’t closed that application meaning app is running in background, that’s why red microphone icon show on top left corner of your iPhone screen.
You can fix red microphone icon by force closing all applications which are running in background, force restart your iPhone, Reset all settings to fix red microphone icon on iPhone or ipad.