Finnish modder Jani Ponkko (Jani Pönkkö) somewhere found a 25-year-old telephone (an ancient Mobira handset) and decided to turn it into a personal computer. Oddly enough, the idea proved successful .
The motherboard, the SSD hard drive, the cooler and all the interface connectors were pushed into the phone case, and the WiFi card, sound card, speaker, information OLED display and status LEDs were put in the receiver. The tube connects to the base of the cord, which was replaced with a USB cable, so it turned out to be a complete PC.
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Under the link - the detailed instruction. Photos and videos under habrakat.