If you upgraded your iPhone SDK to the final version supporting iOS 4, you have noticed that everything older then SDK 3.2 vanished. After some research, I found out you can build with 4.0 SDK and still run on devices with earlier versions of the firmware.

If you want to be compatible with iPhone OS 3.x you still compile for SDK 4.0, but set the target settings to tell that yout iPhone app can run on 3.x (iPhone OS Deployment Target). If you did not use any iOS 4.0 specific APIs then your app will run smoothly on 3.x and 4.x… Read on to learn more.

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