Screen blank during calls

[Members_dKC20iv]

Hello, I use Samsung s10, everything was going great but noticed lately that my screen goes off during calls preventing the other person from hearing me. How to fix this?

[DannyT]

Hey there, @Members_dKC20iv.

Your screen turns off when on calls due to the proximity sensor. This stops you from pressing the screen with your ear and saves battery when on a call. But this shouldn't stop people from hearing you. 

Does this happen on all calls? For example even when on loudspeaker?