How to Fix Face ID That Is Not Working on Your Phone
2026-10-14 · Marion Phone Repair
Face ID fails to unlock your phone, does not recognize you, or asks for your passcode every time. Facial recognition problems are usually caused by a software issue, a sensor obstruction, or changed appearance rather than broken hardware. This guide covers every fix for Face ID on iPhone and face unlock on Android phones.
Clean the front sensors
Face ID and face unlock use sensors at the top of your phone screen. Even a thin layer of grime blocks them:
iPhone (Face ID): The TrueDepth camera is in the Dynamic Island (iPhone 14 Pro and later) or the notch (iPhone X through 14). Clean the entire top area of the screen with a soft, lint-free cloth. Pay attention to the notch or Dynamic Island area — oils from your skin, sunscreen residue, and pocket lint accumulate there
Samsung and Android (face unlock): The front camera handles face recognition. Clean the front camera lens with a soft cloth. Even a fingerprint smudge on the lens can cause recognition failures in low light
Screen protectors: Thick or poorly aligned screen protectors can cover or partially block the Face ID sensors. If Face ID stopped working after installing a new screen protector, remove it and test. If Face ID works without the protector, the protector was the cause — replace it with one specifically designed with cutouts for the Face ID sensors
Check for obstructions
Sunglasses: Most sunglasses block the infrared light that Face ID uses to map your face. Standard polarized sunglasses prevent Face ID from working. If you frequently wear sunglasses, enable the Require Attention for Face ID option (see below) or set up an Alternate Appearance with sunglasses on
Face masks: iPhone with iOS 15.4 and later supports Face ID with a mask. Make sure the feature is enabled: Settings, Face ID and Passcode, Face ID with a Mask. If this is off and you are wearing a mask, Face ID will fail
Hats, scarves, and hair: Face ID needs to see enough of your face to recognize you. A hat pulled very low, a scarf covering your chin and mouth, or hair covering one side of your face can cause failures. Pull back hair and lower scarves for the scan
Holding the phone too close or too far: Face ID works at a distance of about 10 to 20 inches (25 to 50 centimeters) from your face. Holding the phone 6 inches from your nose or at full arm extension is outside the optimal range
Reset and re-enroll Face ID (iPhone)
If Face ID is unreliable even when the sensors are clean and nothing is blocking your face, reset and re-enroll:
Go to Settings, Face ID and Passcode. Enter your passcode
Tap Reset Face ID. This deletes the current face data
Tap Set Up Face ID. Follow the prompts — slowly move your head in a circle so the sensors capture your face from all angles. Do this in a well-lit room, not in bright sunlight or very dark conditions
After the first scan, tap Continue and do the second scan. The double scan captures your face from more angles and improves recognition
Set up an Alternate Appearance: If Face ID frequently fails because you look significantly different at certain times (with glasses versus without, with a beard versus clean-shaven, or with regular makeup versus without), set up an Alternate Appearance: Settings, Face ID and Passcode, Set Up an Alternate Appearance. This gives Face ID two reference models and significantly improves recognition across appearance changes
Reset face unlock (Android)
Samsung: Settings, Biometrics and Security, Face Recognition. Enter your PIN. Tap Remove Face Data. Then tap Register Face and re-enroll by following the prompts
Google Pixel: Settings, Security, Face Unlock. Delete your face model and re-enroll
Other Android: Settings, Security (or Biometrics), Face Unlock (or Face Recognition). Delete and re-register. The exact path varies by manufacturer
When re-enrolling on Android, hold the phone at eye level and centered on your face. Make sure the room is well-lit — Android face unlock on most phones (except Pixel 4 which had dedicated IR sensors) uses the standard front camera and is much more dependent on lighting than iPhone Face ID
Check Face ID settings (iPhone)
Require Attention: Settings, Face ID and Passcode. Require Attention For Face ID requires you to look directly at the phone with your eyes open for Face ID to unlock. If this is on and you tend to glance at your phone without looking directly at it, Face ID may fail. Turning this off allows Face ID to work even when you are not looking directly at the screen — but this reduces security because someone could unlock your phone while you sleep
What Face ID is used for: In the same settings screen, check that Face ID is enabled for the functions you need — iPhone Unlock, iTunes and App Store, Wallet and Apple Pay, Password Autofill. If a specific function is not using Face ID, its toggle may be off
Accessibility: Settings, Accessibility, Face ID and Attention. The option Require Attention for Face ID can also be toggled here. If you have a physical condition that makes it difficult to look directly at the screen or keep both eyes open, turning this off helps
Software updates
Face ID bugs are occasionally introduced in iOS or Android updates and fixed in subsequent patches. Update your phone to the latest version
If Face ID stopped working immediately after an update, check online forums for reports of the same issue with your phone model and OS version. If it is a widespread bug, a fix is usually released within weeks
On iPhone, if Face ID stops working completely (not just unreliable but entirely non-functional — Settings shows Face ID is Not Available), this can indicate a hardware sensor failure or a software corruption. Try restarting first. If that does not help, try resetting all settings: Settings, General, Transfer or Reset iPhone, Reset, Reset All Settings. This does not delete data but resets all preferences including Face ID
Face ID after screen replacement
If Face ID stopped working after a screen repair, the repair may have affected the Face ID hardware:
On iPhone X through 13, the Face ID components (dot projector, infrared camera, flood illuminator) are part of the TrueDepth camera module at the top of the screen. A screen replacement that damages or disconnects the flex cables connecting these sensors to the logic board will disable Face ID
On iPhone 14 and later, Apple made some Face ID components easier to transfer during screen repairs, but improper handling can still damage them
If Face ID stopped working immediately after a screen replacement, the repair shop should examine their work — a loose connector, a damaged flex cable, or an incompatible screen with a different sensor arrangement could be the cause
Apple screens and quality third-party screens include the correct sensor brackets and alignment features. Very cheap replacement screens may not, causing Face ID sensor misalignment
Environmental factors
Direct bright sunlight: Face ID uses infrared light. Extremely bright direct sunlight contains strong infrared that can overwhelm the Face ID sensors, causing failures. Shield the phone from direct sun or angle it away from the light source
Very dark conditions: iPhone Face ID works in complete darkness because it projects its own infrared light. Android face unlock (on most phones without dedicated IR sensors) requires some ambient light because it uses the standard camera. If Android face unlock fails in the dark, that is normal behavior
Wet face or screen: Water droplets on the Face ID sensors or on your face change how light reflects and can cause recognition failures. Dry your face and the phone screen
When Face ID hardware is broken
If Face ID shows Face ID is Not Available in Settings even after a reset, restart, and software update, the TrueDepth camera hardware may have failed. The dot projector is the most failure-prone component — it can fail from impact damage, water exposure, or age. On most iPhones, Face ID hardware repair requires microsoldering or module replacement. Marion Phone Repair can diagnose whether the Face ID failure is a software issue, a loose connection from a previous repair, or a hardware component failure, and advise on repair options.