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Bad calling on the phone gsm or wifi

when I speak on the phonecall I hear very badly gsm or wifi till example WhatsApp call or facebook massenger call.

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Hi,

Can you hear OK on a call when using earphones with a microphone attachment that is plugged into the phone?

Can you hear OK when using the phone in loudspeaker mode (aka hands free mode)?

Is the phone in a protective case at all? If so can you hear OK when it is out of the case?

Have you checked that the volume level is OK when on a call?

What have you tried?

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