A rotary cell phone where a lot of the functionality is mechanical. It’s a real device that is available for pre-order as a kit, for a price that seems remarkably reasonable ($390). Since it is not manufactured by a major phone or electronics company, I imagine that you’ll be SOL if anything goes wrong with it, especially electronically or with the software… customer support and repair seem like they’d be a challenge. But as a neato knickknack, it seems… neato.
Rotary Un-Smartphone Kit
https://www.youtube.com/watch?v=uV1C-41tq64