Why does fingerprint unlock stop working on an Android phone?
Answer
Fingerprint unlock often stops working because the sensor is dirty or covered, the finger is not placed well, or the saved fingerprint no longer matches. Clean the sensor area, press firmly and completely, check any thick screen protector, then delete and add the fingerprint again. Keep your PIN, pattern, or password as a backup.
Before you start: stop right away if…
- A factory reset erases data stored on the phone. Try the sensor and settings steps first, and back up the phone before any reset.
- Apps or websites that claim to bypass fingerprint or lock-screen checks are not official fixes and can be unsafe. Avoid them.
Follow these steps
Clean the sensor and press firmly
Wipe the screen over the sensor with a dry, soft cloth, and dry your finger. Place the full fingertip on the sensor and keep it there until the phone unlocks or shows a clear message. On many Samsung Galaxy phones with an in-screen sensor, the sensor area is near the bottom center of the screen. If your skin is very dry, a small amount of hand cream can help. Samsung's fingerprint troubleshooting page and Google's Pixel fingerprint sensor help both advise pressing until recognition finishes.
You should see: The phone unlocks on a firm, complete press, or it shows a clear message such as fingerprint not recognized.
Turn off screen modes and check the screen protector
Turn off One-handed mode or Smart View if either is on, because these can change where the sensor area appears. Stop wireless charging and try again, since recognition can drop while the phone charges wirelessly. If a thick, textured, or third-party screen protector covers the sensor, consider removing it or replacing it with a thinner one made for your phone. Samsung's page says to re-register fingerprints after a protector is changed.
You should see: The phone is no longer charging wirelessly, the screen mode is off, and the sensor area looks normal when you try the fingerprint again.
Delete the saved fingerprint and add it again
On Samsung Galaxy phones, open Settings, then Lock screen and AOD, then Screen lock and biometrics, then Fingerprints. Delete the saved fingerprint if the list offers that option, then tap Add fingerprint, Register, and place your finger on the sensor several times until you see Done. On Pixel phones, open Settings, then Security and privacy, then Device unlock, then Fingerprint and Face Unlock, and follow the prompts to delete and add the fingerprint. On some Pixel models, Google's page advises capturing the pad, edges, and tips of the finger. Menu names vary by model and software version, so use the closest matching option.
You should see: The new fingerprint appears in the list, and the phone unlocks with it when you test the lock screen.
Set up a backup unlock method
Open the same Screen lock and biometrics screen and confirm a PIN, pattern, or password is set. Keep this backup in case the sensor still fails. If the fingerprint is rejected on the lock screen, enter the PIN, pattern, or password you normally use.
You should see: A PIN, pattern, or password is listed as your screen lock, and you can unlock the phone with it.
Run the phone diagnostic if the problem continues
If fingerprint unlock still fails, open the Samsung Members app on a Galaxy phone that has it installed, then use Phone diagnostics to check the Fingerprint recognition item. The diagnostic is available only on Samsung devices with that app. If the test fails, or the problem continues after the earlier steps, contact the phone maker or an authorized service provider.
You should see: The diagnostic reports whether the fingerprint sensor passes. A failed result points to the sensor or its connection rather than to your settings.
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Extra tips
What to look for: Whether the sensor area is dirty or covered, whether the phone says the fingerprint was not recognized, and whether your PIN, pattern, or password still unlocks the phone.
Before you change anything: Find out whether the phone's fingerprint sensor is on the screen, on the side, or on the back, since the screen steps apply mainly to in-screen sensors. Note whether you use a screen protector or case, and whether one was added or replaced recently. Make sure you know your PIN, pattern, or password before you delete any saved fingerprint. Back up the phone before considering a factory reset.
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