How do I keep my number pad from disappearing during a call?

Question

When I make a call to a automated system, I have problems with keeping my number pad on the screen.

Example...a call to my voice-mail. When asked to enter my password, my screen keeps going black!  I have to wiggle the phone and jab until I get a number.  How do I keep my number pad from disappearing on me?

This happens anytime I'm asked to enter numbers in an automated system.

Ann154 · Accepted Answer

The power button can be used to turn on the screen if it goes off while on the call.

Otherwise the proximity sensor might be having issues or isn't working properly.