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Should You Upgrade Your iPhone 4 to iOS 7?
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Just found my iPhone 4 On iOS 6 : r/iphone
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iPad (4th generation) - Technical Specifications
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iPhone 4 - Wikipedia
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Update iPhone 4 to iOS 8 or 9 - Is this Possible?
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iOS 4 - Wikipedia
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Update software - Apple iPhone 4 - iOS 7 - Device Guides
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