Here is another lens that lets you capture more cinematic footage with your phone. The ULANZI 1.33XT Anamorphic iPhone Lens has a 1.33x design to bring that 2:40:1 look to your videos. It works with the Filmic Pro camera app for de-squeezing your footage.
This iPhone 11 Pro anamorophic lens also works with Samsung Galaxy, LG, HTC, and other comparable phones. It has a 52mm filter adapter, so you can further enhance your footage. You can find out more about it here.