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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.

Updated:Caption:Photo: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.
1
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iOS 3 - Copy, cut, and paste

Updated:Caption:Photo:Screenshot by CNET
2
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iOS 3 - Landscape keyboard

Updated:Caption:Photo:Screenshot by CNET
3
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iOS 3 - Multimedia messaging

Updated:Caption:Photo:Screenshot by CNET
4
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iOS 3 - Spotlight search

Updated:Caption:Photo:Screenshot by CNET
5
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iOS 3 - Voice memos

Updated:Caption:Photo:Screenshot by CNET
6
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iOS 3.1 - Trim or save as new clip after editing

Updated:Caption:Photo:Screenshot by CNET
7
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iOS 4 - Home screen folders

Updated:Caption:Photo:Screenshot by CNET
8
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iOS 4 - Multitasking

Updated:Caption:Photo:Screenshot by CNET
9
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iOS 4 - Camera zoom

Updated:Caption:Photo:Screenshot by CNET
10
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iOS 4 - Unified e-mail inbox

Updated:Caption:Photo:Screenshot by CNET
11
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iOS 4 - Spell check

Updated:Caption:Photo:Screenshot by CNET
12
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iOS 4.1 - Game Center goes live

Updated:Caption:Photo:Screenshot by CNET
13
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iOS 4.2 - AirPrint

Updated:Caption:Photo:Screenshot by CNET
14
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iOS 4.3 - Search in Safari

Updated:Caption:Photo:Screenshot by CNET
15
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iOS 4.3 - Personal hot spot

Updated:Caption:Photo:Screenshot by CNET
16
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iOS 5 - Notifications

Updated:Caption:Photo:Screenshot by CNET
17
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iOS 5 - Camera editing tools

Updated:Caption:Photo:Screenshot by CNET
18
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iOS 5 - Safari Reader

Updated:Caption:Photo:Screenshot by CNET
19
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iOS 5 - Reminders

Updated:Caption:Photo:Screenshot by CNET
20
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iOS 5 - Twitter integration

Updated:Caption:Photo:Screenshot by CNET
21
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iOS 5 - Twitter integration

Updated:Caption:Photo:Screenshot by CNET
22
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iOS 5 - iMessage

Updated:Caption:Photo:Screenshot by CNET
23
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iOS 5 - PC free for wireless syncing and app updates

Updated:Caption:Photo:Screenshot by CNET
24
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iOS 5.1 - Camera shutter on lock screen

Updated:Caption:Photo:Screenshot by CNET
25
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iOS 6 - Apple Maps

Updated:Caption:Photo:Screenshot by CNET
26
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iOS 6 - Tailored search results in Siri

Updated:Caption:Photo:Screenshot by CNET
27
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iOS 6 - Passbook

Updated:Caption:Photo:Screenshot by CNET
28
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iOS 6 - Facebook integration

Updated:Caption:Photo:Screenshot by CNET
29
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iOS 6 - Hourly forecasts in the weather app

Updated:Caption:Photo:Screenshot by CNET
30
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iOS 7 - A completely overhauled design

Updated:Caption:Photo:Screenshot by CNET
31
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iOS 7 - Control Center

Updated:Caption:Photo:Screenshot by CNET
32
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iOS 7 - New multitasking design

Updated:Caption:Photo:Screenshot by CNET
33
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iOS 7 - AirDrop

Updated:Caption:Photo:Screenshot by CNET
34
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iOS 7 - New design for the camera app

Updated:Caption:Photo:Screenshot by CNET
35
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iOS 7 - iTunes Radio

Updated:Caption:Photo:Screenshot by CNET
36
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iOS 7 - Cover Flow-like interface in Safari

Updated:Caption:Photo:Screenshot by CNET
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