Everyone asks themselves this same question when it's time to upgrade anything - is it worth it? In this situation, this question is "What is the difference between the iPhone 3 and the iPhone 4 and is it worth it?" That isn't a decision I can make for you, but what I will do in this article is highlight the bigger differences and improvements in the new iPhone 4 so that you can make an educated decision on whether or not you are ready to upgrade.