Can I restrict my iPhone app from being used by iPhone3G’s?

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I recommend you use the UIRequiredDeviceCapabilities key in your info.plist. This lets you tell the App Store exactly which capabilities you require instead of which device you require.
If your app “doesn’t run well” on a 3G I’ll guess it is because of performance and therefore you’d want to require a newer processor. Look into setting arm7 as one of your required device capabilities.
For more info look here:
http://developer.apple.com/iphone/library/documentation/General/Reference/InfoPlistKeyReference/Articles/iPhoneOSKeys.html#//apple_ref/doc/uid/TP40009252-SW3

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