The demo video only gives us a glimpse of the front of the device, and the screen appears to wrap around the phone, rolling up from the bottom edge. At least as far as prototypes go, this concept appears to be on the “operational” side of the spectrum — there are at least battery and cellular indicator icons on screen. The rolling display is a flexible OLED panel, measuring 6.5 inches when extended and retracting down to “just over” 4 inches.