ZTE Axon M phone is as you described, but it didn't really catch on. Reviewers of the device did not like the gap from the bezels. I think it hit a sort of uncanny Valley of a gap that the Nintendo DS didn't hit.
DS software was specifically designed to use screens as separate units (for example, actual game video on top, extra data on bottom), not as a unified screen, which helped.
There were other dual screen phones other than the Axon, off the top of my head I can remember NEC Medias W and Kyocera Echo (which was the first Android dual screen phone iirc). There was also a Sony tablet with dual screens, Sony Tablet P.
There were other dual screen phones other than the Axon, off the top of my head I can remember NEC Medias W and Kyocera Echo (which was the first Android dual screen phone iirc). There was also a Sony tablet with dual screens, Sony Tablet P.