iOS versions: Every version of iOS - and the latest iOS version | Macworld
iPhones Compared on Original iOS Versions - iOS 4 vs 5 vs 6 vs 7 vs 8 vs 9! - YouTube
18-year-old developer brings back iOS 4 as an iPhone app
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question] Recently got my hands on an iPhone 4 running iOS 7.1.2. Should I jailbreak it? Btw it's a 32gb white, I also need to replace the battery. : r/LegacyJailbreak