Meet the Lanparte HHG01: a handheld stabilizer for smartphones and GoPro. It combines a 3-axis active stabilization system with gesture controls to improve the quality of your work. It has a brushless motor and a pistol magazine style battery grip, allowing you to switch your battery quickly. The gimbal is made from ABS plastic and aluminum alloy. It will work with various smartphones. The below video shows it in action:
The Lanparte HHG01 is fairly easy to set up and lets you control pan/tilt with your wrist. Not cheap, but it allows you to capture smoother video.