low microphone volume, how to fix it?
How to fix audio routing?
Does this happen only when you use Viber or does it occur with other VOIP apps or GSM calls? If it is only with Viber then I would recommend opening a ticket with our support team so that they can help you out. If it is with all other calls then I would check to see if there is a problem with the device or the headphones. You can open a ticket here: http://bit.ly/1aOwGy2
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