Select2 does indicate its support for desktop browser version to be: IE8+, Chrome 8+, Firefox 10+, Safari 3+, Opera 10.6+
However, I cannot find anything regarding Mobile & Tablet support.
Is there any official statement I have missed?
Simply quoting from the same question I asked on the Github project
Select2 3.5.x should work well in all of the latest mobile devices. It's used in many large websites and we've appeared to have ironed out many of the old issues.
Select2 4.0.0 has not yet been released, but Beta 3 has been tested to work with Android devices without any real issues. We don't have any iOS devices to test on, but more than likely they work well on iOS as well.