Can’t hear or be heard (calling) on my iphone7+ voice memos don’t start at all.

These are signs of an  AudioIC hardware issue. You can:

1. Do an out-of-warranty replacement of your iPhone.
2. Trade in your iPhone towards a new one.
3. Find a competent 3rd party repair site that can do the soldering repairs need, but no guarantees. Also, if you go this route Apple may refuse service on your iPhone in the future.

IamWEB1978 Said:

"Can’t hear or be heard (calling) on my iphone7+ voice memos don’t start at all.: mid I make call the receiver doesn’t hear anything same as me, the speaker icon on my calling page don’t look active and the voice memos doesn’t work if I try to record,the recording icon doesn’t respond to touch. Please suggest what I can do"

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Troubleshooting iPhone Audio:

A Few Links that May Help:

• If you Hear No Sound or Distorted Sound from your iPhone, iPad, or iPod touch Speaker - Apple Support

• Control Audio Playback on AirPods with iPhone - Apple Support

• Adjust Audio and Visual Settings on iPhone - Apple Support

• Adjust the Volume on iPhone - Apple Support

• Volume Output: If you Can't Hear a Person on a Call or Voicemail or if the Sound isn't Clear on your iPhone

• Volume Input: if your Microphone isn’t Working or People Can’t Hear you While you’re on a Call