Apple is testing prototype iPhones with significantly larger screens than current models, according to The Wall Street Journal. The report claims Apple has tested models with screens as large as six inches, a significant increase from the 4-inch screen on the iPhone 5, but they are not expected to be released this year. 5.5-inch Samsung Galaxy Note II vs. iPhone 5 (Source: phoneArena.com)The electronics giant has begun evaluating a plan to offer iPhones with screens ranging from 4.8 inches to as high as six inches, people familiar with the matter say. That would be a sizable leap from the 4-inch screen of the iPhone 5 released last year, and, at the upper end, would be one of t