Here is another lens that lets you get more creative with your iPhone camera. The ULANZI 1.33XT Anamorphic iPhone Lens brings the look and character of 2:40:1 to your footage. It has an aluminum alloy construction with multi-element coated glass for less reflections and glare. The lens has a detachable soft rubber clip not to damage your phone.
This anamorphic lens is compatible with apps such as Filmic Pro. The kit consists of a filter adapter, phone clip, lens, lens cap, and everything you need to get started.[where to get it]