Apple's iOS mobile operating system is now almost 7 years old, and it continues to evolve every few months. With WWDC just a month away, here's a look back at the major releases since iOS 3 and the biggest features that each update introduced.

Editors' note: This gallery was updated May 7, 2014.

Photo by: Apple's iOS mobile operating system is now almost 7 years old, and it continues to evolve every few months. With WWDC just a month away, here's a look back at the major releases since iOS 3 and the biggest features that each update introduced. Editors' note: This gallery was updated May 7, 2014.

iOS 3 - Copy, cut, and paste

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iOS 3 - Landscape keyboard

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iOS 3 - Multimedia messaging

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iOS 3 - Spotlight search

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iOS 3 - Voice memos

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iOS 3.1 - Trim or save as new clip after editing

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iOS 4 - Home screen folders

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iOS 4 - Multitasking

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iOS 4 - Camera zoom

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iOS 4 - Unified e-mail inbox

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iOS 4 - Spell check

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iOS 4.1 - Game Center goes live

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iOS 4.2 - AirPrint

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iOS 4.3 - Search in Safari

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iOS 4.3 - Personal hot spot

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iOS 5 - Notifications

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iOS 5 - Camera editing tools

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iOS 5 - Safari Reader

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iOS 5 - Reminders

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iOS 5 - Twitter integration

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iOS 5 - Twitter integration

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iOS 5 - iMessage

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iOS 5 - PC free for wireless syncing and app updates

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iOS 5.1 - Camera shutter on lock screen

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iOS 6 - Apple Maps

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iOS 6 - Tailored search results in Siri

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iOS 6 - Passbook

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iOS 6 - Facebook integration

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iOS 6 - Hourly forecasts in the weather app

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iOS 7 - A completely overhauled design

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iOS 7 - Control Center

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iOS 7 - New multitasking design

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iOS 7 - AirDrop

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iOS 7 - New design for the camera app

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iOS 7 - iTunes Radio

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iOS 7 - Cover Flow-like interface in Safari

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