How can I keep screen from going back while on a call?

IS THERE AN OPTION TO SELECT TO KEEP THE SCREEN FROM GOING BLACK WHILE ON A CALL?  DOES ANYONE ELSE HAVE PROBLEM WITH PERSON ON THE OTHER END ALL OF A SUDDEN NOT BEING ABLE TO HEAR?  MY PHONE CALL GOES MUTE VERY OFTEN AND THE CALLER CAN'T HEAR ME--I CAN HEAR THEM BUT THEY CAN'T HEAR ME.




Hi DC. Which UMX phone are you using? Phone turning black when you put near your ears is normal, it is to avoid accidental touches. Are you pressing anything accidentally when the mic goes mute?



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