Facial data generally stays on your device
On most modern phones, the facial data captured for unlock is encrypted and stored only in a secure area of the device itself, rather than uploaded to a server β this is part of what makes it a reasonably private way to unlock a phone.
Your passcode is always the backup
Facial recognition never replaces your passcode entirely β it sits alongside it, so if the scan ever fails or the phone restarts, you can always fall back to entering your passcode instead.
Frequently Asked Questions
Does facial recognition work in the dark?
It depends on the hardware: phones with a dedicated infrared sensor can typically recognize a face even in low light, while basic camera-only face unlock tends to struggle in the dark.
What happens if the phone does not recognize my face?
After a failed attempt or two, the phone automatically falls back to asking for your passcode or PIN, so you are never locked out.