Sandmarc's clip-on polarizing filter for the iPhone camera helps reduce glare to make your photos pop - Yanko Design
iPhone Polarizer Filter - SANDMARC
Giai Mobile Camera Cpl Filter With Multi-layer Coating 37mm Polarizing Filter - Buy Mobile Phone Cpl Filter,Camera Lens Cpl Filter,Smartphone Camera Polarizing Filter Product on Alibaba.com
PolarPro releases 'LiteChaser Pro,' a mobile filter system for the iPhone 11: Digital Photography Review
Making a Cell Phone Camera Polarizing Filter From Sunglasses : 7 Steps (with Pictures) - Instructables