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i've got the new version of Xcode which supports only 4.0 as base SDK! If i set the base SDK to 4.0 will my apps able to run on iphone devices with os 3.0? Is this have someting to do with deployment target? If i set the deployemnt target to 3.0, this ensures that any 3.0 device will be able to run my app ok? Because i dont have any 3.0 device for testing my app!