Android has had face unlock since Android 4 ICS back in 2011. Then Apple revived it with the iPhone X. Now, the feature has found its way to just about every phone released in 2018 and is little more than marketing fluff (along with Dual Camera, Octa Cora Processor, and the likes.)
The way Apple does it is by having a mini Xbox Kinect in the notch above their display which creates a 3D model of the users face with invisible laser dots and a time of flight sensor. On Android, however (aside from the few who have taken Apple’s approach like some Huawei & Xiaomi phones), unlocking your phone via facial recognition is inherently insecure, and Android has always made it a point to let their users know about it. Last year, the OnePlus 6 ran into a similar issue, where the phone could be unlocked via a printed version of the users face. The Samsung Galaxy S10 seems to be running into similar problems, as demonstrated by popular YouTuber Unbox Therapy.
As demonstrated in the video above, the Galaxy S10 could easily be unlocked via a YouTube video of the user displayed via another phone. Lewis (Unbox Therapy) was first made aware of the problem by his editor and was able to reproduce it multiple times in the video. Although it isn’t much, Samsung does specify that using your face to unlock the phone is insecure and that you’re better off using your fingerprint.