If you bought an iPhone 4 you are entitled to a free case by Apple as part of the iPhone 4 Case Program. You must apply within 30 days of your iPhone 4 purchase and to qualify for this program, you must purchase your iPhone 4 before 30th September 2010.

To register for a free case, you need to to download the “iPhone 4 Case Program” app from the App Store.

My iPhone 4 Case Program Order