The Amazon Kindle e-book reader is a clever device for anyone who likes to read, but Amazon has also released an app for the iPhone, iPad and iPod Touch that delivers the same features as the Kindle directly to the devices you already own. If you have an iPhone, you can enjoy everything that Kindle has to offer right on your phone. The Kindle app is designed to work well, even on the iPhone’s small screen.
Turn on your iPhone and tap the "App Store" icon on the home screen.
Tap the "Search" icon at the bottom of the screen and type "Kindle" into the search field. Tap the Kindle app that appears in the search results. It will likely be the first app on the list.
Read about the app and tap the button with the work "Free" on it to initiate the download. You will be prompted to enter your Apple ID and password.
Head to Amazon on your computer to purchase books or download free books. Visit the Kindle store and choose the books that you'd like to buy. If you don't have one-click ordering set up, set it up by adding a credit card and billing information. You only need to do this one time. When you select a book, choose to sync it with your iPhone; if you have more than one iPhone or Kindle attached to your account, choose the device from a drop-down menu that allows you to designate where to send the book.
Return to the iPhone and open the Kindle app by tapping the "Kindle" icon on the home screen. The book you just ordered from Amazon on your computer downloads to the iPhone app immediately.
Tap the name of the book from the list in the Kindle app. The book opens at the beginning or where you left off when you last read it. Move from page to page by swiping your finger across the screen or tapping the edge of the page. Tap at the bottom of the page to bring up a toolbar that allows you to change the font size and access extra features for the book.