https://www.theverge.com/circuitbreaker/2017/12/25/16817524/oneplus-5-face-unlock-security-update

One of the OnePlus 5T's most coveted and new features is Face Unlock. Now, the authentication method is rolling out to the slightly older OnePlus 5. Carl Pei, co-founder of OnePlus, tweeted yesterday morning that the security measure will come to the phones. He didn't specify a timeline.

Pei says the feature roll-out follows "popular demand," which makes sense. In The Verge's review of the 5T, Vlad Savov writes that more than anything else, Face Unlock is convenient. It isn't super secure, as his friends were able to spoof it by flashing his phone at his face for a second. But OnePlus only uses Face Unlock to secure phones — not for payments or other sensitive transactions — and users won't be forced into Face Unlock. They can always use the fingerprint sensor built into their OnePlus 5's home button.