I’ve learned a lot from this horusheretic tutorial about hud : Tutorial overview: Working Stamina/health/magic bar that updates to the hud and more - Community Content, Tools and Tutorials - Unreal Engine Forums
so for me you would draw a static texture of the phone in the hand on your hud with hit boxes on the side of phone for events (or what your design is) and a" minimap like" in the place of the screen shown when you click to activate event show camera like in the blueprint example tutorial)