Apple has renamed iPhone OS 4.0 to iOS 4 and has released iOS 4 GM to developers. Gold Master (GM) is near to final release and developers can download via iPhone Dev Center right now. General user will be able to download iOS 4 from June 21st. However, if you’re interested in giving it a shot right now follow the link below to download iOS 4 for iPhone and iPod Touch: UPDATE – iOS 4 Final: iOS 4.
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