Build list legend
|Version of iOS|
Jasper (4.2 - 4.2.4)
Phoenix (4.2.5 - 4.2.10)
|Latest build||8L1 (4.3.5)|
iOS 4 is the fourth version of iOS that was released on 21 June 2010. It was announced on 8 April 2010 at the Apple Special Event. It is the first iOS version issued under the "iOS" rebranding, dropping the "iPhone OS" naming convention of previous versions due to the introduction of the iPad, which shipped with this version of the OS. On the iPhone 3G and the second-generation iPod Touch, those devices running this OS still has the "iPhone OS 4" branding.
Multitasking support via the App Switcher has been added.[a] It can be accessed by double-clicking the home button.
FaceTime has been added, which allows for video calling.[b]
The iBooks app is now supported on iPhone. It was previously only available for the iPad.
iOS 4.1 adds Game Center, which allows users to play and challenge friends in games.[a]
Users can now gift apps to other Apple IDs in the App Store