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You are asking a extremly vague question my friend. perhaps you can clarify........
Export the file from 123D as an STL file and import the file into 3ds Max. Assign ID's to the various parts of the phone (screen, bezel, buttons, etc.) then assign a Multi/Sub-object material to the phone. Note, you can assign video files (e.g., avi) as a diffuse material map for the screen sub-object enabling the simulation of a video on the iPhone. From here you are ready to create your video by defining cameras, lighting, etc. Use Premiere for post-production work.
~Lee