Galaxy S7 echo during calls with speaker

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Possibly worth reading this thread

Issue with echo heard by call receivers on some Galaxy S7 devices

Issue details: Some Galaxy S7 users have complained of an echo at the call receiver’s end. The caller would not be aware of the issue unless the person on the other side of the call complains. Some of these devices were purchased from the Murena Store. Investigation: The development team did a detailed analysis of the issue and has arrived at the following conclusions. The issue is due to incompatibility between the hardware and the software which assists in the noise cancellation. This prob…

… a fix was reported successful in this post in that thread

Issue with echo heard by call receivers on some Galaxy S7 devices

Regarding the echo problem with the S7: I haven’t been able to test it extensively yet, but I just tested one of the suggested solutions from this video “How to fix echo problem on your Samsung Galaxy S8,S7,S6”. At least with one device with which the echo problem occurred so far, I then tested it and the echo then no longer occurred. I activated the option “Mono audio” in the settings, as suggested there. The other advice suggested there is to boot into safe mode once and then boot normall…

I activated the option “Mono audio” in the settings, as suggested there.