Your phone rings when you're in VR. Your watch hand begins to vibrate, you hold up your hand to see the watch is illuminated and blinking. The watch projects a holographic display showing a picture of the caller along with the phone ui buttons. Voice is directed through the rift.
This is made possible by the use of a mobile companion app connected to your PC. It is able to mirror your phone audio and video. Using the smart watch you have access to all of your usual apps without leaving the rift.
Having the ability to view and pin dash windows on the watch would open up a world of possibilities. Such as In game camera access, mobile display, streamers can see and interact with chat. Hame developers can create companion apps that can be used directly in vr.
Smart watch is a no brainer!