Face ID fails for a handful of predictable reasons: something blocking the TrueDepth camera, a corrupted face enrollment, an iOS bug, or a hardware fault in the sensor itself. This guide works through every fix in order, from the fastest to the most involved, so you don’t waste time on the hard stuff before trying the easy stuff first.
Quick Answer
Most Face ID failures are software problems, not hardware. Wipe the front camera area, then go to Settings > Face ID and Passcode and tap Reset Face ID. Re-enroll, restart your iPhone, and install any pending iOS update. If Face ID still shows “Face ID is Not Available” after all of that, the TrueDepth sensor is likely damaged and you’re looking at a repair or replacement decision.
Step 1: Quick Checks for Obstruction and Settings
Before changing anything on your iPhone, rule out the two most common causes that require no troubleshooting at all.
Clean the TrueDepth Camera Area
The TrueDepth camera system sits at the top of your iPhone’s screen, inside the notch on older models or within the Dynamic Island on iPhone 14 Pro and later. It projects 30,000 infrared dots onto your face to map its geometry. A smudge, a screen protector that’s lifting at the top edge, or a case lip overlapping the sensor cluster will cause Face ID to fail or work intermittently.
Wipe the top edge of the screen with a dry microfiber cloth. Check whether your screen protector is cut too high or is peeling at the top. If your case has a raised bezel, confirm it isn’t covering the camera area.
Check Your Face ID Settings
iOS updates and Screen Time restrictions can quietly disable Face ID for certain functions. Go to Settings > Face ID and Passcode, enter your passcode, and verify the toggles are on for the uses you care about: iPhone Unlock, Apple Pay, App Store, and Password AutoFill.
If a toggle is off, turn it on and test Face ID immediately. If it works, you’re done.
Check Your Holding Position
Face ID works reliably when the iPhone is between 10 and 20 inches from your face and your eyes are visible and looking at the screen. Using it flat on a table, from an extreme angle, or while wearing something that covers part of your face will produce failures. That behavior is by design, not a malfunction.
Step 2: Reset Face ID and Re-Enroll
If the quick checks didn’t fix it, the most reliable software solution is clearing the stored face data and starting over.
Go to Settings > Face ID and Passcode > Reset Face ID. After confirming, tap Set Up Face ID on the same screen. Follow both circle-enrollment prompts through to completion, moving your head in a slow, smooth arc each time.
A few things that improve enrollment quality:
- Do the setup in a well-lit room, but not under direct sunlight. Harsh overhead light can interfere with the infrared sensors during the enrollment scan.
- Remove anything that significantly changes your face shape, such as a hat pulled low or a mask.
- If you wear glasses regularly, enroll without them first and then use Set Up an Alternate Appearance to add a second enrollment with glasses on.
After re-enrolling, test Face ID from the lock screen two or three times. If it unlocks consistently, the enrollment data was the problem.
Step 3: Restart and Update iOS
A full restart clears temporary software states that can leave Face ID stuck. Hold the Side button and either Volume button, slide to power off, wait 30 seconds, and power back on.
If restarting does not help, check your iOS version. Go to Settings > General > Software Update. Face ID regressions from iOS bugs do occur, and Apple typically issues patches within a release or two. Install any available update and then recheck Settings > Face ID and Passcode to confirm your preferences are still in place, since major updates occasionally reset them.
Face ID Error Messages and What They Mean
Different Face ID errors point to different problems. Use this table to narrow down the cause before going further.
| Error Message | Likely Cause | Next Step |
|---|---|---|
| “Face ID is Not Available” | Hardware or major software fault | Restart; if persistent, see the TrueDepth section below |
| “Face ID Has Been Disabled” | Too many failed unlock attempts | Enter passcode to restore access; re-enroll Face ID |
| “Move iPhone Higher” or “Move iPhone Lower” | Angle or distance off | Adjust position; follow the on-screen prompt |
| “Face ID is Not Set Up” | Enrollment cleared after update | Re-enroll via Settings > Face ID and Passcode |
| Face ID option grayed out entirely | Screen Time restriction or MDM profile | Check Screen Time settings; remove unintended MDM profile |
“Face ID is Not Available” is the message that warrants the most concern. If it appears immediately after a restart and does not clear after a full iOS reinstall, it almost always points to a TrueDepth sensor hardware problem.
How to Inspect a Used Phone Before You Buy
Face ID After a Screen Repair
If Face ID stopped working immediately after a screen replacement, the repair is almost certainly the cause.
Apple’s TrueDepth camera module is paired to the iPhone’s logic board at the factory. On most models, a non-Apple technician who disturbs the front camera flex cable during a screen swap disables Face ID. This is not something a third-party repair shop can reverse on older models.
On iPhone 14 and later, Apple introduced part-pairing improvements that give Apple Authorized Service Providers more flexibility, but full Face ID restoration after a sensor module replacement still requires Apple or an authorized provider.
If a third-party screen repair is the cause, your realistic options are:
- Take it to Apple or an Apple Authorized Service Provider. They can restore Face ID on supported models at the appropriate service cost.
- Accept that Face ID will not work and continue using a passcode. Every other function on the phone remains intact.
- Get a repair quote and compare it against the phone’s current used market value before committing.
Step 4: When the TrueDepth Sensor Has Failed
If you have cleaned the camera area, reset Face ID, restarted, updated iOS, and the “Face ID is Not Available” error persists, the TrueDepth sensor itself has likely failed.
Hardware faults happen through drops (sometimes without any visible screen damage), water exposure, or component degradation over time. The TrueDepth system is a calibrated array: the dot projector, flood illuminator, and infrared camera all have to be functional and aligned for Face ID to work. If any one component is damaged, Face ID will not initialize.
Repair vs Replace: When Fixing Tech Is Worth It
The repair-vs-replace calculation depends on three things:
- Repair cost. Apple’s pricing for TrueDepth camera repairs varies by model. Get a quote from Apple Support or an Authorized Service Provider before deciding.
- Phone age and condition. If the rest of the device is solid and it’s a relatively recent model, repair may be worth it. On older models, repair costs can approach or exceed what the phone is worth on the used market.
- AppleCare+ coverage. If you have an active AppleCare+ plan, sensor repairs may be covered or discounted. Check your coverage status before paying out of pocket.
If the repair math doesn’t work, or if the phone has other problems alongside the Face ID failure, replacing it is often the cleaner choice.
Replacing an iPhone with a Failed TrueDepth Sensor
When repair costs don’t justify the phone’s remaining value, a used iPhone is a straightforward path back to a fully working device. Used iPhones with working Face ID are typically available at 30 to 60% below new retail pricing on Swappa, though exact prices vary by model, storage tier, and condition.
When evaluating a replacement, confirm a few things before buying:
- Face ID works. Ask the seller to demonstrate it, or buy from a platform where listings are staff-reviewed before going live.
- Battery health is disclosed. On Swappa, sellers are required to disclose when battery health is below 80% and the Apple battery message is showing. Check the listing notes.
- The IMEI is clean and Activation Lock is off. Every iPhone listed on Swappa must have a clean IMEI, no Activation Lock, and must match its listed condition. iCloud Activation Lock: How to Avoid It on a Used iPhone
Swappa listings are reviewed by staff before they go live. If a device doesn’t arrive as described, buyers are entitled to a refund. Payments run through PayPal, which adds buyer and seller protection on top of Swappa’s own policies. The buyer fee is a flat 3%, and listings are free to post.
Why does my iPhone say Face ID is not available?
“Face ID is Not Available” means the TrueDepth camera system cannot initialize. Restart the phone and check for obstructions first. If the error persists after a restart and an iOS update, the TrueDepth sensor has likely suffered a hardware fault, which often follows a drop or a third-party screen repair.
How do I reset Face ID on my iPhone?
Go to Settings > Face ID and Passcode, enter your passcode, and tap Reset Face ID. Then tap Set Up Face ID and complete both circle-enrollment prompts. A fresh enrollment resolves most inconsistent or failing Face ID behavior that is not caused by hardware damage.
Can an iOS update cause Face ID to stop working?
Yes. iOS updates occasionally reset Face ID settings or introduce bugs that affect how the TrueDepth camera initializes. After an update, check Settings > Face ID and Passcode to confirm your preferences are still on. Installing the latest iOS version also picks up any patches Apple has released for Face ID regressions.
Does Face ID stop working after a screen replacement?
It can. The TrueDepth camera module is factory-paired to the iPhone’s logic board. A third-party screen repair that disturbs the front camera flex cable will typically disable Face ID. On most models, restoring Face ID requires Apple or an Apple Authorized Service Provider.
Why does Face ID keep asking for my passcode?
After five failed Face ID attempts, iOS falls back to the passcode as a security measure. This is expected behavior. If it happens constantly, reset Face ID and re-enroll. Repeated failures often mean the stored face data is outdated, the enrollment was done in poor lighting, or something in your appearance has changed significantly since you enrolled.
Should I repair or replace an iPhone with a broken TrueDepth sensor?
Get a repair quote from Apple or an Authorized Service Provider first. On older models, the repair cost can approach or exceed the phone’s used market value, which makes replacement the better financial move. Used iPhones on Swappa typically run 30 to 60% below new retail pricing and must pass staff review before listing.
Conclusion
Most Face ID failures have a software fix. Clean the camera area, reset and re-enroll Face ID, restart your iPhone, and install any pending iOS updates. Work through those steps before assuming hardware damage. The majority of people who see “Face ID is Not Available” are back up and running after a reset and a fresh enrollment.
If you have done all of that and Face ID still will not initialize, you are likely dealing with a TrueDepth sensor fault. Get a repair quote from Apple before deciding. If the cost does not make sense relative to the phone’s age and condition, used iPhones on Swappa are staff-reviewed, carry clean IMEIs, and are available at 30 to 60% below new pricing.
