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Say hi to Ubuntu for smartphones: Ubuntu Touch.
At first glance, Ubuntu 13.10 for smartphones, aka Ubuntu Touch, looks like any other mobile operating system. Some of the differences are minor. For instance, there's a search bar on the top along with the usual device indicators and the main window displays only what’s currently in use instead of a default selection of icons. A closer look reveals an operating system and user interface (UI) that's not quite like any other mobile UI.
Using the edges: Swipe the Ubuntu Touch's right edge to unlock it.
For starters, under the UI, there's the Mir display server and windows manager. Above it, there's the Unity 8 shell. Ubuntu has been using this shell on the desktop for years. A major difference from other device interfaces is that you start most activities by using the interface's edges rather than icons. For example, to unlock the phone, you swipe from the right edge.