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I am developing an application for iPhone to support multiple devices, iPhone 2-4. I had an issue with the app icon as it was shown pixelated in the iPhone 4 simulator so I have used a new image with higher resolution (300 x 300) to be precise. On the simulator its showing fine for both iPhone 4 and the iPhone device simulators. However, when I ported my app to an iPhone 3 actual device the icon did not show at all and instead I get a blank white icon. I don't have an iPhone 4 yet so I cant tell if the same issue will happen on the physical device.
I am not sure what is the best dimensions/dpi to use for an icon to display perfectly on an iPhone 4 and older devices? Would appreciate a help if possible..