If you are thinking of upgrading your iPhone 3G to Apple iOS 4 as it is now confirmed jailbreakable and unlockable, you must consider the performance impact the new OS will bring to your device as demonstrated below in video.
Hmmm I just tested this in real time against my iphone 3 which has iso4 installed and it was as quick as their iphone with iso 3. I think their iphone with iso4 is just fubar'ed
Make sure to disable multitasking
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