The iPhone 4 is Apple’s “biggest leap since the original iPhone,” at least according to Steven P. Jobs speaking at the WWDC 2010 keynote. Indeed, in the three years since Apple first introduced the iPhone, the device has come quite far. At the same time, the basic concepts behind the iPhone have remained very consistent over the years. Despite regular modifications to the OS and yearly hardware …
The rest is here:
Feature: iPhone 4: the Ars Technica review