Why You Won’t Be Buying a Rollable Phone Anytime Soon

Imagine if your phone or tablet could change the size of its screen depending on what you’re doing? That’s the future Motorola and Samsung envision, as both companies showcased concept devices capable of extending or shrinking their displays with the press of a button. 

Motorola flaunted its concept at Mobile World Congress this week, while Samsung exhibited a slew of shapeshifting prototypes at CES in January. Such concepts prove phone makers are thinking about the next evolution of personal devices beyond today’s static touchscreens. They’re even looking beyond…