Can i subdivide my model in Unity?
Tried this http://wiki.unity3d.com/index.php/MeshSubdivision but not works for me.
I am too lazy to skin models with many polygons 
Why not just subdivide in a modelling programme if this is giving you issues?
EDIT:
Do you want to do this at runtime?
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Mind that more polygons does not mean better quality. Similarly, if you have a low resolution image, increasing the resolution won’t make the image looks better.
I have skinned/morphed character and just dont want to redo all work from begging.
Could be comfortable to have “turbosmooth” directly in unity.