I believe most iPhone apps can work on the iPad (don't expect phone calling apps to work because the pad isn't a phone) but they don't all look very good. I have the iPhone Angry Birds app and use it on both. The iPad app looks better but cost more and didn't add anything new so I just use the app I had. You will find that the iPad version will be more expensive. Sometimes it is worth the extra cost, you get more and they take advantage of your big screen but sometimes it does't matter.
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