An increase in screen size from the current 3.5-inch to 4-inch would mean an overall increase in viewing area of roughly 30 percent.



From Hardware 2.0:

This latest rumor comes a day after sources speaking to the Wall Street Journal claimed that Apple’s next iPhone would have a screen that measured “at least four inches diagonally”.

An increase in screen size from the current 3.5-inch display to 4-inches would mean an overall increase in viewing area of roughly 30 percent.

  Reuters: iPhone 5 to have 4-inch screen