http://www.macworld.com/article/1527...terytests.html
Quote:
The iPhone 3G with iOS 4 lasted 5 percent longer (10 minutes) than the iOS 3-configured iPhone 3G. That’s not a big difference, but frankly, I thought battery life would decrease, not increase, after updating the OS. Interestingly, the iOS 3 iPhone took less time to download our rented movie than the iOS 4 iPhone 3G, though the application downloads were faster with the new OS.
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Sidenote-my wife hates iOS4 on her 3G-slow, crashes, and slow, apparently...she ordered an iPhone 4 today-est. 3 weeks for delivery