Because its fake

I can see that it could be fake but why would someone go through the effort of building a fake prototype three weeks before the official release? It would cost him a good amount of time and money and with no ads on his video, he gains would be even less. Couldn't it be he actually received one of the Apple designer's rejected prototype?

The physical object is real (but non functional), and relatively cheaply obtained apparently.[1] The fake part is placing the image on the screen making it look like it works.

Why? People love posting fake apple stuff to fool people.

1. http://micgadget.com/29451/fully-assembled-iphone-5-mockups-...

Wow, din't know there was a market that sells these kinds of mockups. Thought the guy built it using a 3d printer or some. Thank you for the link. It does look awfully similar to the Mockup #01 from that page.