I did installed Ubuntu touch 20.04 on OnePlus 6t. After I did tried to test the calls, it seems that my microphone sounds like robot. The voice coming to the other side is kind of metallic like with a lots of distortions. Same call between the Oneplus and the other phone but with Oxygen OS installed gives very good results. So I think the problem is somewhere in the Ubuntu Touch.
I did installed Ubuntu touch 20.04 on OnePlus 6t. After I did tried to test the calls, it seems that my microphone sounds like robot. The voice coming to the other side is kind of metallic like with a lots of distortions. Same call between the Oneplus and the other phone but with Oxygen OS installed gives very good results. So I think the problem is somewhere in the Ubuntu Touch.