1) MATLAB Mobile only supports (limited) remote access to MATLAB.
2) MATLAB itself is not available for any phones at the present time. Whether it will soon be available or even if it will be available is something that only Mathworks Sales is authorized to talk about. (As I have posted a number of times in the past: (A) I do not work for Mathworks and do not know; (B) I have no inside information about this so I can only speculate; and (C) I personally doubt it will happen any time soon.)
3) Simulink has target support for Samsung Galaxy S4 and Galaxy Tab 2 at the present time. Whether other Samsung models are planned is not public knowledge (and I do not know.) I think it might be realistic for support to be added for the S5 and S6.
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