The phone is essentially identical to the popular Samsung Galaxy S4, with one exception: It is immense. Really immense. The Mega has a 6.3-inch screen, making it among the largest smartphones in the world -- among because the Sony Xperia Z Ultra has a 6.4-inch screen, winning the bigger-is-better award by a hair. Both are in some ways too big. Hold the Mega to your ear and the other end of the phone will jut comically far into space.