The Motorola Droid Ultra is the thinnest of the bunch at 0.28 inches thick. Though it no longer bears the RAZR name, Motorola claims that it is the thinnest 4G LTE smartphone available today. Its 5-inch display and slim profile make it much bigger than the Mini, but its battery life isn't as good as the Maxx. Touchless control is one of the biggest touted features of the Moto X. Touchless control allows you to perform a number of tasks just by talking to your phone, even if it's sitting idle on your desk. You simply say, "OK Google Now," and the Droid Ultra powers on and awaits your command.