Sure, the very first iPhone released today, but does anyone remember the first Android smartphone?
In October of 1998 HTC’s T-Mobile G1, or HTC Dream as it’s known outside the U.S would launch being the first phone with the Android OS. The G1 was priced at $179 — which was pretty affordable even in those days — and featured top-of-the-line specs including a Qualcomm MSM7201A processor, 192MB of RAM, and 256MB of internal storage (expandable up to 16GB). It also stocked a 3.15MP rear camera, and a 1,150mAh battery.
I feel like this design would work pretty well even for a modern phone. Just flatten the bottom-right menu section and extend the screen over it, and you'd get a regular full-size smartphone with a slide-out keyboard and some handy physical buttons!