Swipe/drag the center phone icon to answer/decline the call, what happens depends on which direction you've swiped it in, and how far you've swiped it.
Credit to @tidnara699 for the original project. I changed the font for all of the text, which required converting the costumes to bitmap. Some of the costumes are still vector. I also changed the phone icon style and added a ringtone randomizer.
