Apparently not. Some people are having problems upgrading. To me, the bigger reason to stay with iOS 3 is the reports that iOS 4 will make an iPhone 3G even slower than it already is. And for what? Folders? No thanks. I already have digital zoom with the Camera Plus app (not to mention video). I’m sure iOS 4 is great — if you have the hardware it was designed for. I don’t and since my only real complaint about the iPhone 3G is that it’s so damned slow, the last thing I want to do is slow it down even more.