3 ms·I use phone in dark a lot, face unlocking is painful.by jimmydoe 2y agoI use phone in dark a lot, face unlocking is painful.jdlshore 2y agoThe iPhone uses an infrared 3D camera and array of infrared dots. It works fine in the dark. I just tried it.jimmydoe 2y agoThat’s strange. Somehow my iPhone 16 failed more than half of times in the dark. I have to turn on the lights or bright up the screen to unlock.