I find the Google Phone app to have very poor basic functionality on my Pixel 3a. Because of the app design, it's often difficult to answer phone calls (app freezes or quits). When I'm on a phone call and another call comes in, it's extremely difficult to switch calls...again, the app either freezes or quits on me. Part of this is because the app requires you to swipe up in order to answer a call, which is the same motion required to pull up or close other apps. Hope improvements can be made!