If you are running iOS 4 on your iphone  3G and it was not as snappy as you expected to be, stop using it. iOS 4 is designated for iPhone 4 that has better processor and RAM, but if you persistently want this OS on your iPhone 3G/3GS these steps could be a way around it. - Hard reset your iPhone 3G By doing hard reset it clear out the busyness ever engaged off your phone, in this case do it twice. These are the steps...