Google Cardboard
It's very cool that they are doing this.  But, for anyone who tries it, there's something very important to keep in mind:  Low latency is critical to VR!  Unfortunately, Android sensors and graphics pipelines have very poor latency.  If you try this and get terrible motion sickness, don't dismiss VR as a vomit inducer.In fact, many people have reported that spending time in VR, and taking a break whenever motion sickness creeps up, actually reduces motion sickness outside of VR.  As in, people are saying "After playing in my Rift for a few weeks, I can suddenly read in the car for the first time!"