iPhone Screen Resolution for iPhone 4 is 960×640 pixels, prior iPhone is 480×320
I had to develop an iPhone specific website recently and working with the iPhone resolution was a key aspect in this development process. The actual pixel density differs on the iPhone models as well, which will effect the appearance of interface elements and graphics for websites and iPhone applications. Of course knowing the resolution and PPI should not be limited to developers, it dramatically effects the graphic and picture quality of any user experience with the device. Here are each iPhone’s details and a picture comparing the two screens:
iPhone 4 screen resolution & pixel density
* iPhone 4 has a screen resolution of 960×640 pixels, which is twice that of the prior iPhone models
* The iPhone 4 also has a much higher pixel density than it’s predecessors, displaying 326ppi (pixels per inch).
Original iPhone, iPhone 3G, iPhone 3GS PPI & screen resolution
* iPhone 2G, 3G, and 3GS screen resolution is 480×320 pixels
* The iPhone 2G, iPhone 3G, and iPhone 3GS has a display of 163ppi (ppi is pixels per inch whereas dpi is dots per inch).
The below image compares the screen resolution of iPhone 3 on the left vs iPhone 4 on the right:
As you can see, the iPhone 4′s increased pixel density makes the resolution significantly better.