Which version are you talking about? The Kindle book with the Audio/Video content? That's just an extra video about the time period. It isn't an audiobook version of the book. The Audible version of the book (not Kindle) should play on your iPhone.
I had bought the audio of 11-22-63, and it's only for an mp3 player? It is the size of a cd so not being up on some of these things I'm depressed because I was so very anxious to hear it...I have so many of the audio books...and I love listening to them at night.