Making a game for iPhone 5 that's also compatible with the smaller 3.5" screens

This is probably a stupid question, but I'm developing a game for the 4" screen of the iPhone 5, and am wondering how it will work for users with an iPhone 4S or earlier. Do I need to upload two versions to Apple, bundled under the one title? I'm not sure if I will be prompted by Apple to do that because I'm not yet up to that process.
Thanks, James
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