Por que minha tela sai durante uma chamada? Não liga mesmo quando pressiono o botão liga / desliga. Só volta após a chamada.
Why does my screen go off during a call? It doesn't turn on even when I press the power button. It only comes back after the call.
Disclaimer: I have a Samsung Galaxy S4
Just giving this a shot in case it works. Are you using the stock Phone app? Maybe you have the
Turn off screen during calls checked.
I have similar problem, on reading this thread i checked on the proximity sensor on the Techno f7 and discovered it was somewhat blocked, i cleaned the blockade and everything went fine. The Proximity sensor is located at the right of the speaker it is a small oblong shaped spot.