If you have an iPhone 7 or 7 Plus, there’s a chance you might run into an Audio IC issue. You will sometimes see a “Recording Failed” or “No Audio Devices” error when trying to record with the Voice Memo App. Or sometimes you cannot put the phone in loudspeaker mode. It will vary depending on circumstances.
Some of the Audio IC symptoms include:
No mic or no speaker.
Speaker button grayed out during a call
Voice Memo app not working
“Recording Failed” error
“No audio devices found” error
iPhone stuck on the Apple Logo but the home button is clickable