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Edited by bencebacsi at 2016-4-27 19:25 \n\n
Set the volume level while in call. If your earpiece is not muted but you still can't hear anything, then that speaker is probably damaged or has a bad connection to the motherboard. A such issue can't be really caused by a software bug. Your phone should be checked by a repairman or contact your reseller for a replacement.
P.s.: I put this demo pic for the sake of others, who didn't understand your issue.
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