The iPhone 4 Case Program officially ended yesterday (Sept 30th). If you have already submitted your redemption and have not received it yet, rest assured, you will as long as your submission was made before the official deadline.
Only iPhone 4 owners are eligible for this program. Download the iPhone 4 Case Program from the Apple App Store (selected regions apply).
The app will check the IMEI and serial number to verify that you have an iPhone 4. Once eligibility is confirmed, you will be able to choose an iPhone 4 Bumper or other case. The Bumper or case will be shipped to you at no charge.