Just resently I looked at the mobile devices based on Linux OS and found some links on OpenMoko project which is basically mini computer with Linux OS. As with full sized desktop, users are free to choose any Linux OS suitable for mobile devices. Unfortunately this phone is still in early development version and hard to say when it will be ready for day to day usage by regular user but, this is the sign of new generation phones that will have FREE OS and will alowe to"hack" it according to users needs. 

Well, I wish somebody would bless me with this phone.

Check this site for expert review of this device: http://www.techtree.com/India/Reviews/Freerunner/551-93139-612.html