The Baton-Shaped Phone by Marc Schömann
Marc Schömann from Germany has created this baton-shaped phone concept. The phone doesn’t have display or physical buttons instead it uses selectional twist to function. You turn the dial of every element to the desired cipher. If you entered the number you turn the first segment “to phone” (green LED). If you want to hang up the call you turn the first segment to “hang up” (red LED).
Source: Behance Network