Here is another smartphone rig that lets you get more serious about filming with your smartphone. The Triad Grip works with your favorite smartphones and action cameras and has 3 shoe and 2 x 1/4″-20 attachment points that let you connect various mics, lights, monitors, and other accessories.
The Triad has 3 matrix grips on the side and top of the frame. This particular kit ships with a smartphone mount and a bunch of essential accessories.[where to get it]