Why does the screen go blank when I try to use the keypad on a call?

Question

I'm having an issue with my keypad screen.  When I'm trying to "Press 4" while on a call, the keypad screen appears randomly for a second then disappears.  It takes a while to press any key, and then sometimes it gets the number more than once, since I'm pressing repeatedly to try to hit when the keypad is there.  Any ideas?  Thanks.

dilbertaz · Accepted Answer

Does the whole screen go blank?  It could be the setting that turns the screen off while on a call to save on battery, it uses the front facing camera to detect your head (or hand perhaps in this case) and blank the screen.