I don't seem to be able to find the right search terms for this one... I was just on a call, and needed to look up the number that a previous call had come from. Normally I'd go into the Phone app and choose Recents. But in this case, because I was currently on a call, opening the Phone app just went to the "call in progress" screen. How do you get out of that screen so that you can access the rest of the app?