Q: When answering the phone I can't hear anything until the person rings me back  for the second time (6plus)

Hey Dalew94,

After reviewing your post, it sounds like you are not hearing people when they call. I would recommend that you read this article, it may be able to help the issue.

If you can't hear a person on a call or voicemail or if the sound quality is poor on iPhone - Apple Support

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