Re: hi friends my note 4 is not working mic ? u have any answer pls tell me
Check the hole with a good light. If there's any lint in it, use a pointed wooden toothpick to loosen it and get it out. Packed lint is a good sound insulator.
If that's not the problem, it's probably either the mic itself, the earphone jack or the motherboard - any of which means a trip to the carrier (it should still be under warranty).