Earlier, I’ve mentioned the Zero Phone on my blog, but I haven’t provided any more links to detailed updates, status, or information on the project. Where is that project at right now? Oh, very interesting. Right now, it’s still at an early development stage, but there is a wiki with a whole bunch of information on how to build your own Zero Phone by hand. Well, at least for building most of the parts. It is a great example of how to purchase and assemble the electronics components of modern style surface mount device electronics, and how to build together a complete embedded system around a Raspberry Pi Zero, featuring a display and keyboard.
20190104/https://hackaday.io/project/19035-zerophone-a-raspberry-pi-smartphone
20190104/https://wiki.zerophone.org/index.php/Main_Page
20190104/https://wiki.zerophone.org/index.php/Sourcing_ZeroPhone_parts
20190104/https://wiki.zerophone.org/index.php/Assembly
20190104/https://wiki.zerophone.org/index.php/SMD_assembly
20190104/https://wiki.zerophone.org/index.php/Keypad_controller
Printed circuit boards? You can buy the printed circuit boards custom printed from manufacturers such as OSHPark (U.S.-based) or DirtyPCBs (China-based).