iPhone: How to use Face ID with a mask – 9to5Mac
Researchers at Tencent’s Xuanwu Lab (via the Wall Street Journal) discovered that you can train Face ID to recognize you’re wearing a mask if you set up the biometric system while wearing half a mask.
The tutorial mentions folding a mask in half and going through the setup process for Face ID. In our testing, that worked, but not very consistently.
What we found the most consistent was using the primary Face ID setup as well as redoing the alternate appearance with a mask to offer the best unlocking results.