The iPhone's OS has changed a lot over the years. Here's a history of iOS, from its smash-hit debut, through apps and Siri, all the way up to the next versio...
A visual history of iOS
The history of iPhone OS - iOS
ios history from ios 1 to ios 7
My History iOS version
Networking 101: Cisco IOS
Jailbreak IOS 7.1 y 7.1.1 iPhone 5S
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