I apologize in advance but I do not know how well to describe this. The feature where when I are on a call, and my phone is dark after a while, like a phone call standby to save battery, it seems to me, before, when I tipped my phone vertically, the backlight would come on to enable me to see the keypad. Under what circumstances does this occur? I think my phone stopped performing this function. I mist press the home button to see it lit up. Is there a setting for this. Hope I explained it properly for you, if not my apologies!