This is a horrible option as it removes the ability to simultaneously talk and browse. Never had trouble with my S10. For me, it's the quality of the audio for the person on the other end when using speakerphone - they just can't hear me unless I put my mouth right up to the phone. I can hear them fine.
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Thank you for providing us with that information.
We would recommend giving this article a try for microphone issues: http://www.samsung.com/us/support/troubleshooting/TSG01001255/