Personal Hackdays building a cell phone

First of a series of posts... my employer generously gave us 6 sets of personal hackdays last year to use as "mini hackathons" to go out and learn something new to us.   Could be anything we wanted personal or not just as long as it involved technology and we learned something.   This is my first one from that series.   I hope to write more detail about it but for now, here is more or less my slide deck from my presentation part of it.  

Hackday #1 - Building a Cell Phone

https://allthethin.gs/hackdays/2020-hackday1-cellphone/page1.html

-Ivan