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The First Iphone / IOS 1
iPhone didn't support 3G, it didn't support multitasking, it didn't support 3rd party apps, you couldn't copy or paste text, you couldn't attach arbitrary files to emails, it didn't support MMS, it didn't support Exchange push email, it didn't have a customizable home screen, it didn't support tethering, it hid the filesystem from users, it didn't support editing Office documents, it didn't support voice dialing, and it was almost entirely locked down to hackers and developers. -
IOS 2 / Iphone 2 / Apps
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IOS 3 / Iphone 3
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IOS 3.2 / Ipad
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IOS 4 / Multitasking / Facetime
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IOS 5 / Siri / icloud
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IOS 6 / Maps
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IOS 7 / Control Center / Air Drop
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IOS 8 supposed to come out