FBX importing in unity (probleme)

In Autodesk Maya i made a cube and changed its poly amount to 20. then i hit a key (3) that smoothed the object. but when i imported it. it wasn't smooth anymore. pls help

As a 5 year user f Maya myself, I can safely say this is a simple fix.

When pressing 1,2,3 keys in Maya, the object doesn't ACTUALLY get smoothed, it mearly shows how the object will look WHEN smoothed.

In order to smooth an object you have to go up to mesh, smooth, or alternative use the short cut bar below.

You will not see "mesh" at the top unless you are in the modelling sub tab.

Hope that helps.