Face ID not working on your iPhone is one of those problems that feels disproportionately frustrating — you reach for your phone, hold it up, and nothing happens. Whether it’s showing “Face ID is not available” after a software update, failing to recognize you in dim lighting, or greying out entirely in Settings, Face ID not working almost always has a fix you can apply in a few minutes.
These steps work on iPhones from the iPhone X through the iPhone 16 series. Most fixes require nothing more than a Settings change or a quick restart — no tech experience required.
Quick Answer
Restart your iPhone first. If Face ID still fails, go to Settings > Face ID & Passcode, delete your existing Face ID, and re-enroll. Check that the TrueDepth camera cutout is clean and unobstructed. If Face ID is grayed out in Settings, install any pending iOS update. Most fixes take under 2 minutes.
What Causes Face ID to Stop Working
Most failures fall into one of these categories:
- Software glitch — A recent iOS update or background process corrupted your Face ID enrollment data.
- Camera obstruction — Dirt, a screen protector edge, or a thick case is blocking the TrueDepth sensor array.
- Too many failed attempts — After five consecutive misreads, iOS locks Face ID until you enter your passcode once.
- Extreme temperatures — Very hot or cold conditions temporarily disable the infrared sensors.
- Hardware fault — Rare, but a drop or liquid exposure can damage the TrueDepth camera.
6 Fixes, Ranked by Ease
Fix 1: Restart Your iPhone
A restart clears memory and resets Face ID’s background process — it resolves roughly a third of cases on its own.
- On iPhone X or later: press and hold Side button + Volume Down until the power slider appears.
- Drag the slider, wait 30 seconds, then press the Side button to power back on.
- Try Face ID in good lighting at a comfortable arm’s length.
Pro tip: If Face ID locked after too many failed attempts, just enter your passcode once. That’s all it takes — Face ID reactivates automatically for the very next unlock attempt.
Fix 2: Clean the TrueDepth Camera
The TrueDepth system lives inside the notch (iPhone X–13) or Dynamic Island (iPhone 14 Pro and later). Even a thin smear of sunscreen or cooking oil on the sensors is enough to cause repeated failures.
- Power off your iPhone.
- Lightly dampen a lint-free microfiber cloth with water — no spray cleaner or alcohol.
- Gently wipe the strip at the top of the screen, including the small dot (flood illuminator) and pinhole (dot projector).
- Dry with a second cloth, then power on and test.
Fix 3: Remove Your Case and Screen Protector
A thick silicone case or full-coverage tempered glass protector with raised edges can partially block the TrueDepth camera, especially in portrait mode.
- Remove the case and screen protector entirely.
- Test Face ID bare.
- If it works, the accessory is the culprit — look for a thinner case or one specifically labeled as Face ID-compatible.
Troubleshooting tip: Magnetic wallet cases that wrap around the front of the phone are a documented cause of intermittent Face ID failures. Switching to a rear-attached wallet case solves it immediately.
Fix 4: Reset and Re-Enroll Face ID
Corrupted enrollment data is the most common non-hardware cause of persistent Face ID failures. Re-enrolling takes about 90 seconds and fixes the problem cleanly.
- Open Settings > Face ID & Passcode and enter your passcode.
- Tap Reset Face ID and confirm.
- Tap Set Up Face ID and complete both scanning circles — once straight-on, once with a gentle head tilt.
- Add an Alternate Appearance (same menu) if you regularly wear glasses or change your look significantly.
Fix 5: Install Pending iOS Updates
Apple ships Face ID bug fixes in point releases. A known iOS bug caused Face ID to gray out on certain devices after launch; the fix arrived in the next point update, not a major version release.
- Connect to Wi-Fi with at least 50% battery.
- Go to Settings > General > Software Update.
- Tap Update Now if one is available. Most updates complete in 5–10 minutes.
Fix 6: Reset All Settings
This resets every system setting — Wi-Fi passwords, wallpaper, display preferences — without erasing your apps or files. It often resolves stubborn Face ID failures caused by a corrupted settings database.
- Go to Settings > General > Transfer or Reset iPhone > Reset.
- Tap Reset All Settings (not Erase All Content and Settings — that wipes your data).
- Enter your passcode and confirm. The iPhone restarts in about 2 minutes.
- Re-enroll Face ID after it reboots.
Which Fix to Try First
| Symptom | Best Starting Fix | Time |
|---|---|---|
| Stopped working after an iOS update | Fix 5 — Install Update | 10 min |
| “Face ID is not available” message | Fix 1 — Restart | 1 min |
| Fails only when the case is on | Fix 3 — Remove Case | 30 sec |
| Fails consistently indoors and out | Fix 4 — Re-enroll | 2 min |
| None of the above resolved it | Fix 6 — Reset Settings | 5 min |
Common Mistakes to Avoid
- Holding the phone flat or too close. Face ID is calibrated for roughly 10–20 inches from your face, held upright. Lying it flat on a desk almost always fails — hold it the same way you’d answer a call.
- Re-enrolling with polarized sunglasses on. Polarized lenses block Face ID’s infrared light. Enroll bare-faced first, then add a second enrollment via Alternate Appearance wearing your glasses.
- Jumping straight to a factory reset. “Reset All Settings” (Fix 6) resolves the same underlying issue as a full erase in most cases — without wiping photos, apps, or messages.
- Ignoring the “try again later” message. This prompt appears when the iPhone is overheated or very cold. Let the device return to room temperature before running any fixes.
- Assuming five failures means Face ID is broken. Five consecutive misreads trigger a temporary lockout — entering your passcode once is all it takes to re-enable it.
Frequently Asked Questions
Can a screen replacement break Face ID?
Yes. Third-party repairs that don’t use Apple Genuine Parts can break the secure pairing between the TrueDepth camera and the iPhone’s Secure Enclave chip. Apple-certified repairs preserve Face ID; uncertified ones frequently don’t. If Face ID stopped working after a non-Apple screen swap, contact Apple Support for a hardware assessment.
Does Face ID work with a face mask?
Full-face mask unlock requires iOS 15.4 or later and a paired Apple Watch. Without the Watch, a mask covers enough facial geometry to trigger repeated failures. You can also set up a separate Face ID enrollment wearing your mask via Settings > Face ID & Passcode > Set Up an Alternate Appearance.
Why does Face ID fail only sometimes?
Intermittent failures most often point to a case edge, dirty sensor, or lighting issue. Strong backlighting — like standing in front of a sunny window — can overwhelm the infrared sensors. Testing in even, moderate indoor light usually confirms whether a lighting issue is the cause.
Will resetting Face ID delete my passcode?
No. Resetting Face ID removes only the facial enrollment data. Your passcode remains fully intact and is required to complete the re-enrollment process.
Face ID is completely grayed out in Settings — what does that mean?
A grayed-out Face ID option typically indicates a detected hardware fault (common after a drop), a Screen Time restriction, or an MDM management policy. Check Settings > Screen Time > Content & Privacy Restrictions > Passcode Changes. If nothing is restricted, contact Apple Support for a hardware evaluation.
Conclusion
Face ID not working is almost always a software or setup issue rather than a hardware failure. Work through the six fixes in order — restart, clean the camera, remove the case, re-enroll, update iOS, then reset settings — and most iPhones are back to touch-free unlocking in under 10 minutes. For other persistent iPhone problems, see how to fix iPhone Bluetooth not connecting and what to do when iPhone notifications stop showing up.