My brother was able to unlock mine through Face ID even though my phone had only one face registered. Face ID updates you face as it changes[0]. So, I guess wh

My brother was able to unlock mine through Face ID even though my phone had only one face registered. Face ID updates you face as it changes[0]. So, I guess whenever my brother used my phone it added my brother's face features since algorithm probably found some similarities in face features. [0] https://www.theverge.com/2017/9/27/16373710/face-id-iphone-x-apple-facial-recognition-impostor https://www.theverge.com/2017/9/27/16373710/face-id-iphone-x...