Okay, this thing looks pretty cool
https://www.kickstarter.com/projects/albertgajsak/makerphone-an-educational-diy-mobile-phone?
Open source DIY mobile phone kit
Runs apps written in arduino-flavoured C++, Python, and Scratch
@troubleMoney like, this is a pretty ideal bit of kit - particularly to expand upon.
@troubleMoney looks like I'm going to be building a phone next spring