How to Replace your iPhone 4 back cover step by step
The iPhone and its cousin the iPod Touch are products of genius design, but sometimes we get a little bored of all that black and white with nothing in between. Inject some personality into your mp3 listening or phone calling by simply switching up your black plate, or the back cover.
No, Apple does not approve of it, but yes, you can do it easily at home (just don't tell the Apple store!). Check out this iPhone 4 tutorial to learn how to pry open and replace the back cover.