This is the proximity senor problem most of these have you can put some screen protector film over the proximity sensor area on the inside of the lcd, try the sharpie trick ( I believe covering the underside of the sensor area with sharpie marker), or newest one I heard is covering the inside of the prox area with a piece of earpiece mesh. I sell the new white i4 lcds like the ones on the actual phones with the proximity sensor fix for $54/pc.