You can never be too rich, too thin or have too much screen real estate. Kyocera agreed back in 2011 when it launched the Echo, a dual-screened Android handset that let you use the two displays as one or use a nifty Simul-Task mode that allowed you to run a different app on each screen. You could also use the bottom panel as a keyboard.
Unfortunately, the Echo fell on deaf ears and Sprint stopped selling the devie in the fall of 2011. We haven’t seen anything like it since. The phone lacked 4G and its design was bulky, but in a parallel universe where this phone was a runaway hit, all the handset makers now have dual-screen devices running Android 4.1 with LTE.