The only company that is investing to develop a free software platform for mobile phones which I know of, is ACCESS.
http://www.access-company.com/home.html
A few years ago there was a company called Palm which developed smartphones (treo, etc.) with the PalmOS proprietary operating system.
http://en.wikipedia.org/wiki/Palm_OS
Then the PalmOS division left Palm and formed a new company called Palmsource but the OS was still proprietary.
Later a company called ACCESS acquired Palmsource and now they are working on APL: Access Linux Platform (they called the system Linux instead of GNU/Linux).
http://www.access-company.com/products/linux/alp.html
They hope to begin selling smartphones with APL before the end of 2007.
Is the Mobile GNU/Linux era beginning?
:)
http://www.palminfocenter.com/news/8514/access-linux-platform-shown-at-linux...