What are the difference between an iPhone 3 and iPhone 4 and is it worth it?
This is a discussion on What are the difference between an iPhone 3 and iPhone 4 and is it worth it? within the iPhone Help forums, part of the iPhone Forum category; I must admit the iPhone 4's screen directly compared to the 3GS's puts it to shame......
Assuming you mean the new iPhone 4 and the still current iPhone 3GS, there are a substantial number of differences between these models in design, display, capability, performance, battery life and more.
For most users, the iPhone 4 is "worth it," but an independent comparison can be useful for you to decide whether the lower upfront price of the iPhone 3GS is more important than the other differences.
Also, keep in mind that most of the cost is not upfront, but is tied to the plan. This can be worthwhile to provide a better idea of the total cost of ownership.