Ubuntu for phones by Canonical – Industry proposition
Introducing Ubuntu for Mobile phones. Ubuntu PC operating system being the most popular FAST, FREE, USER-FRIENDLY and AWESOME they now comes to your hand in a mobile operating system
The open-source Ubuntu smartphone OS expected to come in 2014.
Even though it shows every much similarities to most of the modern mobile operating systems like, Android, RIM’s Blackberry, Web OS, Palm, it has a promising potential to compete for the first three places in mobile industry.
Its very hard to complement any other mobile OS being an Android fan from the beginning, even before they release the Android OS, I have been a fan since the development stage. Now I see the same potential in this Ubuntu Smartphone OS. I hope they allow users to dual-boot (side-load) Android and Ubuntu together in single device
Watch Ubuntu founder Mark Shuttleworth explain Ubuntu’s mobile strategy and what it offers industry partners.
Here’s the Ubuntu phone hands-on demo by TheVerge.
And here’s something interesting, Ubuntu On A Galaxy Nexus Hands On Review by Engadget.
According to this, the developer community can make their own ROMs to load Ubuntu Mobile OS in existing Android devices, Until manufactures come up with some brand new Ubuntu Smartphones in 2014. 
Update – 7th Jan 2013
Ubuntu OS on Galaxy Nexus
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can i install new Ubuntu in my HTC sensation xe???
I suggest the most interesting reason why users are willing to kick off google’s android for ubuntu is that google is spying their users for search, and who knows for what else ; ) let’s see how it will finally work out, but I see a lot of potential for mobile ubuntu!