Here is another smartphone filmmaking rig that helps you take your videos to the next level. The SV Rig lets you attach microphones, lights, lenses, and other accessories to your phone without a whole lot of hassle. The side and top handles can be mounted anywhere on the rig. You also get a 6000mAh wireless charger.
The SV rig is ready for vertical and horizontal shots. It comes with 6x cold shoes, 18 x 1/4″ threads, and a 17 x 3mm lens mount. You can use this with smartphones from 64 to 87mm.[where to get it]