Whatsapp calls - caller cannot hear me

I own a pretty old Samsung Galaxy S2 loaded with Android 2.3.3.
I can use all the functionalities of Whatsapp but when I make or receive a Whatsapp call the other party cannot hear me. I can hear them perfectly.
Does anybody have a solution to my problem (other than ditching my S2 and upgrading to something better)????

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I have this old HTC One. Same story.
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change your phone

change your phone dude

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