These are not seams lines, these are just polygons of the mesh, In blender you see them smooth, but in unity it looks like seams lines,how can i fix that ? I’m using unity free .
Looks like the normals are messed up. Try to have Unity recalculate them on import.
Did, didn’t help :S
Looks to me like the UVs are messed up. If you change the texture to a completely white texture, do the seams disappear? If so, then I think something is causing the UVs to not be imported correctly.