I'm beginning to wonder if my face id has something against fat ugly people. it shudders when I look at it and refuses to open. all you people who have no issues, do you look like George Clooney? I look like Hagrids left testicle after a hard night drinking and no matter how many times I reset face id, it doesn't work as well as others are making out.
Don't get me wrong it does work sometimes, not if I'm lying down. guess it cant differentiate between the folds of my neck and cheeks. The screen is ok, doesn't pop as much as I was hoping for. but for me the best part of the phone is also the worst... face id. I love how it doesn't show notifications until I look at it, but as stated above its too hit and miss.
Well I might be able to help here. I've found when lying in bed holding my phone on my chest that my phone won't unlock. I realized that in this lying position, my chin is against my chest, and I do have a bit of extra flesh under my chin that "spreads out" when I'm chin-down. FaceID is probably measuring an increase in dimensions around my chin and jawbone when I do that.
The solution I've found is to raise my chin up (so I'm basically looking towards the ceiling) and hold my phone directly above me. Then it reads my face.
So I think if you pay attention to how your head is positioned when you train FaceID, you may need to duplicate that when you unlock.