I disagree. Having owned all those phones; I felt the 3GS->4 was a much bigger update to the iPhone compared to 3G->3GS. The 4 introduced the retina display whi

I disagree. Having owned all those phones; I felt the 3GS->4 was a much bigger update to the iPhone compared to 3G->3GS. The 4 introduced the retina display which was far more noticeable than the 3G to 3GS performance increase.