iPhones are pretty decent digital cameras. They have gotten a lot better over the years. To produce higher quality videos, you should think about investing in a camera stabilizer. Wiggly is more than that. It is a modular 3 axis stabilization system for shooting with iPhone and other compact handheld devices.
Wiggly helps you avoid capturing shaky footage with your smartphone. It can turn two full rotations on either axis. The design is quite compact. You can change cameras in seconds. Wiggly offers low-mode handling with another joystick. This modular camera stabilizer is compact, versatile, and sturdy (partially made of high grade anodized aluminum). The project is on Kickstarter at this time.