Face ID Not Working? How to Fix It on iPhone

You pick up your iPhone, glance at it, and nothing happens — just the passcode screen. If Face ID has stopped working, you’re not alone, and the fix is often simpler than you think.

False acceptance rate: 1 in 1,000,000 ·
Infrared dots projected: 30,000 ·
Introduced with: iPhone X (2017) ·
Requires: iOS 11 or later ·
Compatible devices: iPhone X and later, iPad Pro 3rd gen and later

Why has Face ID suddenly stopped working?

Physical obstructions or coverings

• Face ID requires your eyes, nose, and mouth to be fully visible (Apple Support).
• Remove any case, screen protector, or film covering the TrueDepth camera area.
• Masks, scarves, hats, and sunglasses with certain coatings can block the infrared sensors (Apple Support).

Recent iOS update issues

• Some users report Face ID failing after updating to iOS 17.2.1 (Apple Support Community).
• An update can reset Face ID settings or introduce temporary bugs.
• Apple’s official recommendation: install the latest iOS version (Apple Support).

Hardware damage from drops or water

• If the TrueDepth camera is damaged, Face ID may become unavailable (Apple Support).
• Drop damage, liquid exposure, or unauthorized repairs often permanently disable the system.

The pattern: most sudden failures can be traced to either an update or a physical obstruction, making the first fix attempt a simple check of the camera area.

How do I fix the Face ID on my iPhone?

1. Restart your iPhone
   Press and hold the side button and either volume button until the slider appears. Slide to power off, wait 30 seconds, then press the side button to turn back on. After restart, lock the phone and test Face ID.
2. Update iOS to the latest version
   Go to Settings > General > Software Update. Install any available update, then restart the device.
3. Reset Face ID and set up again
   Open Settings > Face ID & Passcode, enter your passcode, tap “Reset Face ID”. Set up Face ID anew — move your head to cover all angles during the scan.

The implication: proceeding through these steps in order eliminates the most common software culprits before resorting to hardware service.

What disables Face ID on iPhone?

Settings that disable Face ID

• Face ID can be toggled off entirely in Settings > Face ID & Passcode (Apple Support).
• If “Require Attention for Face ID” is turned off, the phone may not recognize deliberate glances.

Lost or broken TrueDepth camera

• A damaged TrueDepth camera triggers a “Face ID Not Available” message (Apple Support).
• Apple repairs that replace the camera also disable Face ID — it’s tied to the original hardware pairing.

Restrictions like attention awareness turned off

• Under Settings > Accessibility > Face ID & Attention, you can check if Attention Awareness is on (Denver Phone Doctor).
• If it’s off, Face ID becomes less secure and may fail more often.

What this means: the user should treat the Face ID settings screen as a first checkpoint — many disablements are accidental toggles.

Why is my Face ID acting weird?

Environmental factors: low light or direct sunlight

• Strong sunlight can overwhelm the infrared projector, causing false failures (Apple Support).
• Face ID works in the dark because it uses infrared, but bright ambient light can interfere.

Partial obstructions like glasses or scarves

• Polarized or coated lenses may block the infrared beam (Apple Support).
• Try different glasses or remove a scarf to see if recognition improves.

Software glitches after standby

• Waking from standby may briefly delay the camera initialization. A quick press of the side button can help.

The pattern: “weird” behaviour almost always points to temporary outside interference rather than a permanent hardware fault.

Why can I no longer use Face ID on my iPhone?

After repair that replaced the TrueDepth camera

• Apple’s repair process disables Face ID if the camera unit is swapped, even with genuine parts (Apple Support).
• Unauthorized repairs may lose Face ID permanently.

After restoring from backup

• Restoring from a backup can sometimes reset Face ID enrollment; you may need to re-enroll.

After detecting a serious security breach

• Face ID locks out if the phone detects tampering or a hardware mismatch.

The catch: when Face ID disappears from Settings entirely, the hardware has failed — no amount of software tinkering will bring it back.

Make sure your eyes, nose and mouth are fully visible to the TrueDepth camera.

Apple Support documentation

Our first suggestion is the simplest: Restart your device and enter your passcode.

Asurion tech tip

The difference between a quick fix and a repair bill often comes down to one question: did you drop it or update it? For anyone with a sudden Face ID failure, the pattern is clear: try the software steps first, and if the camera is physically damaged, prepare for Apple service. For those still under warranty, AppleCare+ covers TrueDepth camera repairs. Users without AppleCare+ face a replacement that can cost hundreds of dollars.

If you’re considering upgrading, check the iPhone 17 Pro Max Price Ireland and Galaxy S25 Plus to Buy.

For drivers experiencing similar issues with their vehicle’s display, our Apple CarPlay troubleshooting guide offers step-by-step solutions for connection problems.

Frequently asked questions