Check out http://docs.unity3d.com/Documentation/ScriptReference/Input.GetTouch.html. The first example on this page shows how you can change the position of an object by using Touch. I'd imagine you can use the delta values from the example to change your x and y angle.
Check out http://docs.unity3d.com/Documentation/Manual/PlatformDependentCompilation.html for how to write code that runs on different platforms.
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