Big screens won.For the past three years, the most meaningful change to the iPhone has been the size of its screen. After years of sticking with a 3.5-inch display and watching Android-powered competitors bite off a piece of the market with ever-larger screens, Apple relented ever-so-slightly with the 4-inch iPhone 5 and 5S, and then finally gave in to obvious trends with the much larger 4.7-inch iPhone 6 and massive 5.5-inch iPhone 6 Plus.Big screens are all people really wanted in a phone; when they couldn′t get big screens from Apple, they bought big screens from Samsung, and when Apple fin..