How to dial during a phone call?

When I make a phone call, the screen goes immediately black and the only action possible is to hang up with the button near the camera. So when I’m asked by an answering machine to dial 1 for this, 2 for that, etc, I just can’t do it! That is highly frustrating!
Any suggestion on how to keep my screen active during a phone call?

A post was merged into an existing topic: FP2 Screen can’t be reactivated during/after calls - See first post for Workarounds