mesh import problems: black spots on my mesh?

Unity Engine
1

i imported my model from xsi as an fbx in unity3d. on the mesh you can see i have black meshes… why is this? how can i fix this?

243588--8741--$picture_2_945.png

2

This is an issue with the normals. You need to harden/crease some of the edges/normals on the phone and/or tesselate the geometry in spots around where this is occurring.