4 in order to be more inclusive to the iPod Touch and iPad.

iOS 4 was officially released on June 21, 2010.

System features

Folders

iOS 4 added folders for apps, which raises the maximum number of home screen apps from 180 to 2,160. These folders would automatically be named based on the containing apps' respective App Store category.

Multitasking

iOS 4 introduced multitasking, replacing the home button shortcuts

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