The electronics giant has begun evaluating a plan to offer iPhones with screens ranging from 4.8 inches to as high as 6 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 the largest on the market. Such plans signal further that the Cupertino, Calif., company is shifting its smartphone strategy as it searches for new engines of growth, and as competition with Samsung Electronics.
