After several months of beta testing and bug fixes , iPhone 3G OS 3.0 /firmware 3.0 is available for download .iPhone OS 3.0 will bring several hundred features into iPhone 3G and iPod touch and is considered to be a major update .All iPhone 3G users can update to latest version of iPhone OS by connecting their iPhone 3G /iPod touch to their desktop and by using iTunes .Check out these finished screenshots of  iPhone OS 3.0 installation.
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