iphone update 3.1.3 is available or not

HowTo Update To iOS4 on I Phone 3GS, 3G and iPod Touch.

Apple hasreleased a new firmware update are the iPhone and iPod touch - v3.1.3. Thechanges mostly include bug fixes and performance improvements in the form ofimproved accuracy for reported battery level on the iPhone 3GS.
No new features have been added and users would have to wait for the elusive v3.2 firmware for those. The 3.1.3 update is an available as a free downloadover iTunes for all the iPhones and iPod touch users. The update weighs in ata hefty 228.1 MB, which might seem a lot for just a couple of bug fixes. Thosewho have jail broken their devices are advised to wait as the new update willmess with your jailbreak. Apple today released iPhone OS 3.1.3 for all iPhone and iPod touch models, addressing several specific bugs as well as offering fixesfor a handful of security issues. This update for the iPhone and iPod touchcontains bug fixes and improvements, including the following. IOS4 will be released to the general public on June 21, this is different fromthe I OS4 GM release which was released for developers.