@nelmariharmzen@AppleSupport How did you get on? It seems that there's a decent number of iPhone7 users who have had their microphones bricked after the 11.3/4 update
@nelmariharmzen Thanks for getting back in touch with us. We've got a few more steps we'd like to check. Can you let us know in DM after you've checked the steps in this article? Look under "Get help": apple.co/2rhLq9Gtwitter.com/messages/compo…
@AppleSupport It's running on 11.4.1. My microphone doesn't work. People on calls can't hear me. Can't record voice memos. When I plug earphones in, the phone doesn't recognize them, but it still charges. I see lots of people are having the same problem.