If this has already been covered, I apologize in advance as I am a new user to the Note 5 but not the the Galaxy Note series. On my Note 4 I never had an issue using the speaker on a phone call. When I receive or make a call on my N5 and push the speaker icon it goes to green and I can hear the other person through the external speaker but they can't hear me. I have to turn speaker off and put it back up to my ear so we can hear each other. I've been through the setting but nothing I do resolves the problem.