Testing on your computer is great for checking whether graphics look like you expect them to, previewing animations, and trying out the flow of your ad; but they don't compare to the experience of touching and interacting with your immersive iAd.
iAd Tester is the fake placeholder app we used in the iOS Simulator to test our iAd. Apple has made the app available so we can install it and test ads directly on our iOS devices. With iAd Tester, we can access iAds on our device, remotely on our Mac, and wirelessly from the iAd Test Server.
In the previous screenshot, you can see the iAd Tester running on an iPhone 4.