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iOS version by device — iOS Ref
iOS compatibility checker: Find the latest iOS version for your iPhone …
About iOS 7 Updates - Apple Support
iOS 7.1 on the iPhone 4: As good as it’s going to get
How to install iOS 7 on your iPhone 4S, iPhone 5, iPad, and iPad …
How to Update an Old iPhone - Techlicious
The iPhone 4 on every version of IOS (IOS 4 - 7) - YouTube
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What is the latest iOS version for iPhone 4? - Ask Different
Update iOS on iPhone - Apple Support