This Substratum theme lets you change emoji system wide. Theme Works On: OMS ROMs ROOT is required. THEME WILL NOT WORK ON CMTE / SAMSUNG ROMs and STOCK NEXUS ROMs. Current Emoji Packs: iOS 10. 3. IOS Flat 10. 3. Android Oreo. Android Nougat 7. 1. 1. Android Marshmallow. Emoji One 3. 1. 2. Twitter. Windows 10.