The "open hardware" phone project that's had the most interest

[Pascal Gosselin]

While I understand the needs/wants of open hardware, the average 
smartphone user really couldn't care less. That's the core of the 
problem, lack of a large user base.

HOWEVER, what a *lot* people seem to be interested in, is an open 
architecture MODULAR smartphone that could be customized.  You want a 
bigger battery ?  A better GPS ?  A better camera ?   Audio/video inputs 
?  Discrete inputs ?   Serial ports ?  Ethernet ? Absolutely !

Close to 900,000 people have indicated current interest in making this 
happen.

http://www.phonebloks.com/

If technically feasible, this project I believe stands the best chance 
of obtaining funding as the concept has wide appeal.

Otherwise, while not ideal, the supported ability to load open source 
firmware on nice current hardware would mostly negate the need for 
something like an "Ubuntu Smartphone".  Most Android hardware vendors 
however seem quite focused on making certain that your phone won't last 
very long, they are "abandonware" products. Lots of decent phones 
officially stuck at Android 2.3 or earlier and hard to root.

-Pascal