The chaos of unlocking your phone in 2018

Samsung's new flagship devices have both a front-facing 8-megapixel camera and an iris scanner. These work in tandem for "Intelligent Scan", which combine the secure identifying nature of your eye's unique makeup with a camera that detects your face. Samsung believes its iris scanner isn't as effective in bright light as it is in the dark, thus it's included the more traditional camera backup this time. With the new system, the S9 tries to sign you in with your eyes by default, but when that fails, it will use facial recognition. Samsung says the technology is learning-based, which means it should improve its ability to latch on to your face as you continue to use it.