600000 people pre-ordered iPhone 4 on a single day and this rush of fan boys left both Apple and AT & T web servers down for many hours. If you wonder why so many people are rushing for iPhone 4, here is the chart that explains the difference between iPhone 3GS and iPhone 4.
As Steve Jobs said at WWDC 2010, iPhone 4 is definitely going to change smart phone game all over again.
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