I'm afraid I have no idea about iphones as I've never owned one and don't plan to (although it's getting harder to live without one).

I thought you had it already and then I thought it might have been Ed. It's a good read; quite disturbing but with a sort of Tom Clancy narrative push to it so you are constantly turning the pages even as the world is ending. Once you stop is when the fear really kicks in. I'll have a look around to see if I can find a small version which will fit on a phone.