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Help No sound during calls

WKFO

Lurker
I am using Samsung Galaxy S7. (G930F)

Both the speaker and microphone is working pretty well except when I am calling or receiving a call. The phone rings but when I answer the call, there is no sound, which makes the whole "phone" function of the device useless.

I got every setting to default, didn't work. I tried going back to factory mode, didn't work. I even tried a manual re-flash of official firmware. (Android 6.0.1)
It didn't fix the problem; furthermore the re-flashing process randomly decided to put a password to lock my device (also tripped the warranty void counter in download mode). Fortunately after some research I found it out to be "default_password". Anyway, I was able to use my device again, but the problem persisted.

So, finally, in a desperate attempt to solve my problem I am asking you for help.
 
Did anything change when it started happening? New device? Are you using WiFi calling? Have you tried using a Bluetooth device to see if it still happens?
 
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