Today Apple has announced about the iPhone OS 4.0 which includes many features to give a tough competition to other Mobiles out there in the market. iPhone OS 4.0 Features Multitasking, Folders, Mail, iBooks, Enterprise, Game Center and iAd. iPhone OS 4 will be available for the users in Summer, but the Developer preview is released today. So if you are a Developer and have enrolled to the iPhone Developer Standard or Enterprise Program then you can Download iPhone OS 4.0 and Beta SDK.

iPhone OS 4.0 beta firmware is available for iPhone 3GS, iPhone 3G, iPod touch 3G and iPod touch 2G. iPhone OS 4 build is 8A230m.

iPhone OS 4.0 beta Firmware Download

• iPhone OS 4.0 beta (iPhone 3GS) – iphone_os_4_beta_iphone_3gs_8a230m.dmg
• iPhone OS 4.0 beta (iPhone 3G) – iphone_os_4_beta_iphone_3g_8a230m.dmg
• iPhone OS 4.0 beta (iPod touch 3rd gen) – iphone_os_4_beta_ipod_touch_3rd_generation_8a230m.dmg
• iPhone OS 4.0 beta (iPod touch 2nd gen) – iphone_os_4_beta_ipod_touch_2nd_generation_8a230m.dmg

You must be a developer to download the iPhone 4 Firmware. Just go to the below link to download iPhone OS 4.0 – http://developer.apple.com/iphone/index.action#prerelease.