Can someone point out where the "solutions" are in this thread? I see that I have to turn off LTE but that is really not a solution. My wife and I have two S9s on AT&T and using the speaker phone mutes/diminishes the microphone volume.
@userX32FTLAj1r f you have tried all the troubleshooting in this thread and are still experiencing these symptoms we would recommend a service repair. Can I please have your full model number and IMEI number in a private message?