iPhone 5 http://snapvoip.blogspot.com/
With everybody waiting for the iPhone 5 this June, Apple is looking to make it different and attractive, than previous iterations of iPhones and specially encroaching multitudes of Android devices. Most Android phones employ 4" or larger screens.
So according to Digitimes, One of those changes will be a 4' screen on iPhone 5;
The component suppliers noted that the production lines for Apple's next generation iPhone have begun testing, and Apple is interesting in expanding the screen size to 4-inches to support the tablet PC market as the vendor only has a 9.7-inch iPad in the market.
Read more at Digitimes