[Sarah-Jane Crowson]

Oh, I LOVE these kinds of puzzles.

I'd say 'none'. You are holding the iphone and looking in the mirror and the installation. You will see a representation of the iphone, not the phone itself.

(I also usually get them wrong. I still love them though)

Sarah-Jane

(I've just read the thread more carefully - I was in a rush before - and now realise that you don't want the representation answer. I guess then it depends what you are focussing on. Are you holding up the iphone in front of you and deliberately looking for reflections?)