3D object wich can't be edited correctly in photoshop
I study media design and I have to make a promotion video of a Iphone App. I want to make a moving 3D iphone with the application displayed on the screen. Because I want to make a moving Iphone with the application displayed on it, I downloaded a 3D model of the Iphone 4. I Know how to texture this in photshop but this model seems to have something special, for me this special feature or something, results in not conceeding my project. Does anybody know what this special thing is?, what's its for? and how can i resolve this problem?
The 3D model in PS looks something like a metal iphone with several areas that have white - grey or black colors. I realy realy realy like to do this project in 3d!, so please somebody help me.