YouTuber and inventor Marcin Plaza wanted to create an original phone and decided to make it himself, combining the external display of a Samsung Galaxy Flip5 with the keyboard of a BlackBerry Q10 in one device. He showed the process in a video on YouTube.
He used a Galaxy Flip5 with a broken internal display, printed his own case using a 3D printer, and transferred all the necessary internal components into the new case. It took a lot of time and effort, but in the end it all worked out.
Meanwhile, the YouTuber printed another case, in which he installed the keyboard from the BlackBerry Q10, where he also placed the second battery from the Flip5. Marcin Plaza spent a lot of time getting the keyboard to work. He decided to take advantage of Android's support for external keyboards, but for this he needed a printed circuit board to add a Type-C port to the keyboard.
To emulate the keyboard, the YouTuber had to solder an Arduino Pro Micro in addition to the printed circuit board, and he successfully did so. After that, Marcin Plaza ordered a new case made of non-plastic, placed all the internal components, connected the two parts of the smartphone with new fasteners, and received a finished device with a large thickness and a small screen.
It's hard to say how practical such a device is, but it looks very interesting. Plus, it's capable of running Minecraft and YouTube.