Why can't the recipient of my phone calls hear me?

I have done a factory reset,tried a new sim card and made no difference.and

What you still could do is use the Lumia software recovery tool.
https://forums.windowscentral.com/e?...token=o9crgTLy

If this does not work then you may have a hardware problem and should sent it for a repair.

First, make sure they aren't trolling you. Next, follow the steps of Harrie-S.