Together with your Android or iOS smartphone, the POP. Cardboard 3.0 is your ticket to the virtual reality 3D world. Start the app or movie and place your phone into the POP. Cardboard. Hold it up to your eyes and look through the two lenses. A slightly offset image will be displayed on the screen for each eye, creating real 3D right in your hands. The accelerometer in your smartphone detects your head movements and translates them into the virtual world. When you look up, the image moves up; when you look left, the image moves left, and so on. This gives you an immersive experience.