Dialler Pad App While on a Call


Android Expert
I have a Samsung Galaxy S3 and I hate the dial pad that appears while I'm on a call. The dial pad is close to the top of the screen. When I enter DTMF tones while on a call, such as when I need to enter my voicemail password and commands, my finger hovers too close to the proximity sensor. This causes the screen to blank out on occasion. I would like a way to replace this dial pad to one where the dial pad is on the bottom half of the screen.

I have tried some third party dialler apps, but every time I'm on a call, the original dialler app appears. Is there any app that allows me to replace the default dial pad while I'm on a call?