Meet Helium Core: an iPhone camera rig with multiple mounting points around it to allow you to attach your flash, lights, microphones, and other gear. It has an aircraft-grade aluminum construction and tool-less design. The iPhone 6 Plus version has 17 mounting points.
The chassis is designed so that you can attach lenses to your iPhone to do more with its camera. The open back design reduces the chances of your phone overheating.[where to get yours]