Here is another film-making rig that lets you do more with your smartphone. The SMALLRIG Video Rig has holes for your microphone, lights, and other gear. It has spring loaded wide jaws that can hold phones up to 86mm wide.
This cage lets you attach your Lightning and headphone cables without having to remove anything. It has two cold shoes and 1/4″-20 threaded holes. It is made of aluminum alloy and carbon fiber.