At this year’s WWDC 10, Apple not only unveiled iPhone 4, but also released iOS 4 GM candidate (formerly iPhone OS 4) for developers registered on iPhone Developer Standard or Enterprise program. iOS 4 is fully supported on iPhone 3GS and iPod touch 3rd gen. iPhone 3G and iPod touch 2nd gen will be able to run this version of OS too but without multitasking and background wallpapers (unless you know where to look for it). Both the first-gen iPhone and iPod touch is not supported. An iPad version of iOS 4 is expected to be out by this fall.

Here are the screenshots from iOS 4.0 GM (Build 8A293)

Home screen Home screen

 Lock screen Lock screen

Change Wallpaper Change Wallpaper

 Change Wallpaper (2) Change Wallpaper (2)

 Game Center Game Center

 Game Center (2) Game Center (2)

 Folders in iOS 4 Folders in iOS 4

 Folders in iOS 4 (2) Folders in iOS 4 (2)

 Editing Apps in Folder Editing Apps in Folder

Multitasking Multitasking

 Multitasking (2) Multitasking (2)

 Closing Apps running/paused in Background Closing Apps running/paused in Background

 iPod Controls in Multitasking Switcher iPod Controls in Multitasking Switcher

 Universal Inbox Universal Inbox

 Threaded Email Messages Threaded Email Messages

 Mail App Mail App

 Digital Zoom in Camera App Digital Zoom in Camera App

 Microsoft Bing in Safari Microsoft Bing in Safari

iOS 4 will be available publicly via the new iTunes 9.2 on June 21st 2010. iPhone 4 will be released on June 24th.

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