ZTE Merit help please.

view story

http://androidforums.com – Help please. When I make a call I lose the dial screen. I can not use the center button to return to the screen. It makes a sort of vibrate when some one I call answers and the dial screen is gone. Therefore when I make a call and need to use the dial pad for a menu it is unavailable and I can not do anything except push the button at the top to turn it off. (General)