Just make sure it's an iPhone still supported by iOS apps. On Android you can get old working versions of apps outside the Playstore. Apple has a deliberate policy that the app has to be updated or is kicked out of the store. Then it can't be installed on iOS phones/tablets that are perfectly good but can't be updated to the latest iOS.
But Apple Store uses a variation of ePub. You can upload the SAME epub 2 to Amazon and Smashwords and Smashwords will distribute it to the Apple Store, where it gets an Apple wrapper. They also distribute to Barnes & Noble, Kobo, Tolino and Libraries.
About 1/3rd of our sales are via Smashwords despite Amazon's 90% of ebook sales.
But if it's really needing fixed layout forget about real ebooks, make a PDF for 10" and larger screens.
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