If I understand patents correctly the supporting claims don't matter it's the parent claims. Break one part of the parent and the rest falls apart.
Part of claim 1 the only parent claim...
"a detection mechanism configured to alter the portable electronic device based on whether the removable portable electronic device is mounted on the frame"
That's easy... Mount the display in the headset. Push a on screen button launching VR mode. Device changes to VR mode. Take off the headset, touch the screen - since you won't be touching it while watching it, and device comes out of VR mode. It's not like you need to be that lazy to have it automatically start when put in.
If I'm right Samsung / Google I just saved you both some trouble. If I'm wrong then please tell me where so I'll learn something.