How to Load a Texture From Iphone user's Picture Favorite Fold

I want to load a photo from Iphone user’s Picture Favorite , and display it in Unity3D as a 3D texture.
I guess may be the WWW.LoadImageIntoTexture() would be usful.But I don’t know the URL of Iphone Picture Favorite.

Can any one give me any suggestion,thanks a lot .

http://unity3d.com/support/documentation/Manual/iphone-basic.html

Unity iPhone supports the native plugin system, where you can add any feature you need – including access to Gallery, Music library, iPod Player and any other feature that the iOS SDK exposes. Unity iOS does not provide an API for accessing the listed features through Unity scripts.