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Many times during calls i hear some noise like electric fence making sound. It comes from the speaker, not from the other person speaking on the opposite side. I made sure that none of the other phones are getting calls nearby. Has anybody else experienced it? Please look into this asap.
You can test the speaker via Settings > About phone > Diagnostics.
If you can't hear this noise during the test of the speaker I suggest that you try using another SIM card.
If you can hear this noise during the speaker test I think that this needs to be examined and fixed at a repair center. For more information about how to submit your phone for repair and where, contact your local support team.