https://www.cnet.com/news/samsung-galaxy-s9-intelligent-scan-unlock-favors-ease-over-security/ >Unlocking the Galaxy S9 might be faster -- but that doesn't mean it's more secure. >Samsung's newest smartphones, the Galaxy S9 and S9 Plus, include a new feature the company calls Intelligent Scan. The technology combines Samsung's secure iris scanner with its less-secure facial recognition unlock technology. When unlocking your phone, it first will scan your face. If that fails to unlock the phone, the device then will check your irises. If both fail, Intelligent Scan will try to authenticate your identity using a combination of the two. And it all happens almost instantaneously.