In the past, meaning upgrading the iPhone 3G to iOS4, upgrading the OS version on an older device was a pain. With the lessons learned from the iPhone 3G/iOS4 upgrade, it appears that Apple has learned its lesson. From the various reports, the upgrade is smooth with people experiencing the3200...

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UPDATE - On 081110 Apple put out iOS 4.0.2 that closes the PDF Vulnerability. This is the same exploit used by JailBreakMe.com to unlock your iPhone 4. DO NOT update to iOS 4.0.2 until the iPhone Dev Team has a jailbreak tool available. Check their blog for updates. Always...

THIS GUIDE COVERS iPhone OS 3.1, NOT 4.0. For a very good guide on jailbreaking your 3G under iOS 4.0, please use this iClarified article on jailbreaking the iPhone 3G iOS 4.0 under Windows. I've had my iPhone 3G for quite awhile now and, when I got it originally...