Start with the silliest thing, because it fixes the most cases: clean the sensor strip at the top of the screen and check that a case, a badly fitted screen protector or a finger is not covering that area (Solution 1). If the iPhone says 'Face ID is not available' or asks you to set up Face ID later, restart the phone before touching any setting: that message is usually temporary (Solution 3). If it fails only in certain situations, such as with sunglasses, with a new beard or lying in bed, add an alternate appearance instead of starting over (Solution 4). Resetting Face ID and enrolling again is Solution 5, and it clears most stubborn cases. If the unavailable message comes back on its own after every restart, especially after a drop or a screen replacement, the cause is physical and Solution 7 explains what to expect.
What causes this problem
- Dirt, grease or steam on the sensor strip at the top of the screen, which is where the iPhone projects and reads the dots on your face.
- A case, screen protector or car mount covering part of that strip, even when the camera itself looks clear.
- An angle or distance outside the expected range: the phone flat on a desk, very close to your face, or used while lying down.
- A real change in appearance, such as a new beard, different glasses, heavy make-up or a mask, while the matching setting is switched off.
- A temporary system glitch after an update or after days without a restart, which produces the Face ID unavailable message.
- Physical damage to the sensor array, common after a drop or after a screen replacement done outside authorised service.
- Know your passcode before you start. Several steps require typing it, and some of them switch Face ID off until you enrol again.
- Watch the pattern of the failure: it never works, it fails only in certain positions, or it fails only at certain times and places. Each pattern leads to a different fix.
- Note whether any message appeared on screen. 'Face ID is not available' and 'Face ID could not be activated' point down a different route than a silent failure where the phone tries and asks for the passcode.
- Take the case and the screen protector off before testing, to rule out the most common physical cause in one go.
- If the iPhone was dropped, met water or had its screen replaced recently, read Solution 7 before spending time on settings.
Solutions, in the order to try them
1Clean the sensor strip and clear the top of the screen
Face ID does not use the camera alone: it projects thousands of invisible dots onto your face and reads the reflection with its own sensor. Anything over that strip interferes with the reading, and fingerprint grease, pocket dust and bathroom steam are enough to wreck the hit rate. It is the most common cause and the quickest to rule out.
- Clean the strip at the top of the screen with a soft dry cloth, the kind used for glasses. Do not use alcohol or household cleaner.
- Take the case off and check that it does not intrude on the sensor area. Thick cases and folio cases often cover part of it.
- If you use a glass screen protector, check that it is properly aligned and has no opaque edge across the sensor strip.
- Notice how you hold the phone: an index finger resting on the top of the screen covers the sensor without you realising.
- If you are in a car with a magnetic mount, or somewhere with strong direct sunlight on the screen, test in another setting before concluding there is a fault.
2Check the Face ID settings and the attention option
Plenty of people think the feature broke when in fact it is switched off for that specific function. Face ID can be on for unlocking and off for payments, or the other way round. The setting that requires attention also blocks unlocking when you wear sunglasses or do not look straight at the screen.
- Open Settings and go to Face ID and Passcode. Enter your passcode when asked.
- Confirm that the switches for the functions you use are on, particularly the one for unlocking the iPhone.
- Check whether a face is enrolled at all. If the screen offers to set up Face ID rather than reset it, there is no active enrolment.
- If you wear sunglasses or find it hard to look straight at the screen, turn off the option that requires attention to unlock. That lowers security slightly and should be a deliberate choice.
- If you often wear a mask, turn on the matching setting where your model offers it, and complete the extra enrolment the system asks for.
3Restart the iPhone when 'Face ID is not available' appears
That message, and the variation asking you to set it up later, almost always signals a temporary glitch in the process that drives the sensors, not a fault. It shows up often after system updates or after many days without a restart. A full restart brings the feature back in most of these cases and touches no data.
- Shut the phone down from the shutdown option inside Settings, under General, and wait thirty seconds before switching it on again.
- If the screen is unresponsive, force a restart: press and release volume up, press and release volume down, then hold the side button until the Apple logo appears.
- Once it is back on, test unlocking about three times before drawing any conclusion.
- If the message returns straight away, go to Settings, General, and check whether a system update is available. Fixes for this kind of glitch usually arrive through updates.
- If the message always comes back, even right after each restart, that points to a physical problem rather than a setting: go to Solution 7.
4Enrol an alternate appearance
This is the feature fewest people know about, and it clears intermittent failures without wiping the current enrolment. It lets you store a second face, and that serves either another person or you in another state: with glasses, with a grown-out beard, with heavy make-up, with your hair tied back, or at that lying-down angle where Face ID always fails. The original enrolment stays valid.
- Open Settings, Face ID and Passcode, and enter your passcode.
- Tap the option to set up an alternate appearance.
- Enrol in exactly the condition where unlocking fails: with the glasses you wear, in the lighting where the problem shows up, in the position you normally hold the phone.
- Turn your head slowly around both scanning circles, completing both passes.
- Test afterwards in both conditions, the original and the new one. If you have two problem situations, pick the more frequent one, because there is only one alternate appearance slot.
5Reset Face ID and enrol your face from scratch
When unlocking fails in every situation and the settings are correct, the enrolment itself may have become corrupted. Resetting deletes the stored face model on the phone and lets you build a clean new one. You lose no personal data, but you depend on the passcode until the new enrolment is done, so do it when you have a moment.
- Open Settings, Face ID and Passcode, and enter your passcode.
- Tap the option to reset Face ID.
- Tap set up Face ID and follow the scan, holding the phone about thirty centimetres from your face, screen facing you, in a well-lit room.
- Take off sunglasses and anything covering your face during this enrolment, and leave those variations for later as an alternate appearance.
- Complete both scanning passes without rushing and test unlocking several times before deciding whether it improved.
- If the iPhone cannot finish the enrolment and shows an error partway through, skip to Solution 7.
6Update the system and reset settings
If the problem started right after an update, or if it comes with other odd behaviour, a system setting may be inconsistent. Resetting settings returns everything to defaults without deleting photos, messages or apps. It is invasive enough not to be the first step, and safe enough to be worth trying before a repair shop.
- Open Settings, General, Software Update, and install whatever is available. Keep the phone on the charger during the process.
- If that does not help, go to Settings, General, and find the section for transferring or resetting the iPhone.
- Choose reset and then the option to reset all settings. That option does not delete your data, but it removes saved Wi-Fi networks, wallpapers and system preferences.
- Do not choose the option to erase all content and settings, which is a full wipe and is not needed here.
- After the restart, enrol Face ID again and test.
7Recognise the signs of a hardware fault
There is a clear line between what software can fix and what it cannot. The sensor array sits behind the top strip of the screen and is sensitive to impact. There is also a detail that catches many people out: after a screen replacement done outside authorised service, Face ID usually stops working for good, because the sensors are paired to the original device.
- Suspect hardware if the Face ID unavailable message reappears a few minutes after every restart, without exception.
- Suspect it too if the phone was dropped, squeezed in a pocket or met water, even if the screen did not crack.
- If the screen was replaced recently, ask the repair shop whether the original sensors were transferred. Without that, no setting brings the feature back.
- Test the front camera in an ordinary camera app. A good photo does not rule the problem out: the Face ID sensors are separate from the normal lens.
- Before taking it in for service, make a full backup and note your passcode. You will need it to unlock the phone after the repair.
- In the meantime, keep using the passcode to unlock and to confirm payments: the phone remains secure and fully usable.
Applies to
| System | Status |
|---|---|
| iPhone with Face ID, recent iOS versions | Confirmed |
| iPhone with Face ID on older iOS versions | The settings exist, but some features such as use with a mask depend on the model and version |
| iPad with Face ID | It behaves the same and accepts the device in landscape; the sensor strip sits on a different edge |
Menu names can change slightly between versions. If a step above does not match what you see on screen, the official support page from the manufacturer has the most current wording for your version.
Frequently asked questions
Last checked: Oct 20, 2026 · We review this guide whenever the manufacturer changes the process.