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What the error means
Your Apple Watch may still deliver notifications, handle calls, or ping your iPhone while iPhone unlocking fails. Those functions working is useful diagnostic information, but it does not prove that the separate authentication state used by Unlock with Apple Watch is healthy. Apple’s support instructions describe how the feature works, but do not define this message as a general diagnosis of all iPhone–watch communication.
The message was widely reported during the iOS 14.5–15 period, including on some iPhone 13 devices. Apple addressed the iOS 15 issue in iOS 15.0.1, released October 1, 2021; that historical fix does not establish the cause of a present-day error. A current failure can instead involve an unmet requirement, a temporary wireless or authentication state, outdated software, or a stale pairing. 9to5Mac’s report on iOS 15.0.1 covers that specific historical issue.
Check that your devices and setup qualify
Apple lists these minimum requirements for Unlock with Apple Watch: an iPhone with Face ID (iPhone X or later) running iOS 14.5 or later, and an Apple Watch Series 3 or later running watchOS 7.4 or later. These are published minimums, not a guarantee that every older device supports every later operating-system release. Check the software offered for your particular devices.
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![Apple Watch Series 11 [GPS 46mm] Smartwatch with Jet Black Aluminum Case with Black Sport Band - M/L. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/416RQ0rtsUL._SL160_.jpg)
- A FULL-FEATURED HEALTH TRACKER—Apple Watch Series 11 gives you invaluable insights about your body, right from your wrist. Take an ECG anytime* and get alerts for a high and low heart rate or an irregular rhythm*—so you can stay closer to your heart. You can also view your overnight health tracking metrics with the Vitals app* and be notified of possible sleep apnea.*
- KNOW YOUR SLEEP SCORE—With advanced sleep tracking, Series 11 gives you a daily sleep score. It’s an easy way to help measure and understand the quality of your sleep, so you can make it more restorative.
- GET HYPERTENSION NOTIFICATIONS—Did you know that Series 11 can spot signs of chronic high blood pressure? By analyzing how your blood vessels respond to beats of the heart, it can notify you of possible hypertension.*
- SAFETY FEATURES—A smartwatch that puts your safety first. Series 11 can detect a hard fall or severe car crash, automatically help connect you with emergency services, and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- A POWERFUL FITNESS TRACKER—With advanced metrics and motivating features like Pacer, Heart Rate Zones, training load, and Workout Buddy powered by Apple Intelligence from your nearby iPhone*—Series 11 is made to help everyone stay active, from runners and hikers to strength-training enthusiasts.
- The watch must be paired with the iPhone, nearby, on your wrist, and unlocked.
- A passcode must be set on the watch, and Wrist Detection must be enabled.
- Wi‑Fi and Bluetooth must be turned on for both devices. They do not need to be joined to a Wi‑Fi network.
- The feature is intended for supported situations in which Face ID cannot see your full face, such as wearing a mask or covering your eyes with sunglasses or ski goggles. It is not a general replacement for Face ID.
Apple’s full requirements and setup guidance are in Unlock your iPhone with Apple Watch. The setting is at Settings → Face ID & Passcode → Unlock With Apple Watch; enter your iPhone passcode and enable the switch beside the relevant watch. Apple also documents the setting in its Apple Watch User Guide.
Try the low-risk fixes first
1. Wear and unlock the watch
- Put the watch on your wrist and enter its passcode if it is locked.
- Keep it close to the iPhone.
- Wake and unlock the iPhone, then try enabling the setting again.
A powered-on watch sitting nearby is not enough; Apple requires it to be worn and unlocked.
2. Check passcode, Wrist Detection, and wireless radios
On the iPhone, open Watch → My Watch → Passcode. Confirm that a watch passcode is enabled and that Wrist Detection is on, if the option is shown. Wrist Detection is part of the feature’s security requirements. Apple’s guide explains how Apple Watch locks and unlocks.
Rank #2
![Apple Watch Series 11 [GPS 42mm] Smartwatch with Rose Gold Aluminum Case with Light Blush Sport Band - S/M. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/31caPPnRysL._SL160_.jpg)
- A FULL-FEATURED HEALTH TRACKER—Apple Watch Series 11 gives you invaluable insights about your body, right from your wrist. Take an ECG anytime* and get alerts for a high and low heart rate or an irregular rhythm*—so you can stay closer to your heart. You can also view your overnight health tracking metrics with the Vitals app* and be notified of possible sleep apnea.*
- KNOW YOUR SLEEP SCORE—With advanced sleep tracking, Series 11 gives you a daily sleep score. It’s an easy way to help measure and understand the quality of your sleep, so you can make it more restorative.
- GET HYPERTENSION NOTIFICATIONS—Did you know that Series 11 can spot signs of chronic high blood pressure? By analyzing how your blood vessels respond to beats of the heart, it can notify you of possible hypertension.*
- SAFETY FEATURES—A smartwatch that puts your safety first. Series 11 can detect a hard fall or severe car crash, automatically help connect you with emergency services, and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- A POWERFUL FITNESS TRACKER—With advanced metrics and motivating features like Pacer, Heart Rate Zones, training load, and Workout Buddy powered by Apple Intelligence from your nearby iPhone*—Series 11 is made to help everyone stay active, from runners and hikers to strength-training enthusiasts.
Check that Wi‑Fi and Bluetooth are on for both devices. If you are unsure whether a radio is enabled, check in the full Settings app rather than relying on its Control Center appearance. The devices need Wi‑Fi turned on, but do not have to connect to a Wi‑Fi network.
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3. Restart both devices
Restart the iPhone and Apple Watch normally, then test again with the watch worn and unlocked, the iPhone awake, and both devices nearby. A normal restart is a sensible way to clear a temporary state. Do not force-restart by default; reserve that for a device that is frozen or unresponsive.
4. Install available software updates
- On iPhone, open Settings → General → Software Update and install the latest update offered for that device.
- On iPhone, open Watch → My Watch → General → Software Update and install any offered watchOS update.
- Restart both devices after updating, then try the setting again.
Software releases and compatibility change, so use the updates offered for your own devices rather than assuming a particular version is current. The past iOS 15 fix shows why updating matters, but it is not a universal explanation for this error.
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![Apple Watch SE 3 [GPS 40mm] Smartwatch with Starlight Aluminum Case with Starlight Sport Band - S/M. Fitness and Sleep Trackers, Heart Rate Monitor, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/31YiTby0pOL._SL160_.jpg)
- GET SMARTER HEALTH INSIGHTS—Apple Watch SE 3 is an advanced health tracker that helps you better understand your body. The smartwatch sends alerts for an irregular heart rhythm, or an unusually high or low heart rate.* You can view your overnight health tracking metrics with the Vitals app,* track your sleep score, and get sleep apnea notifications.*
- A GREAT FITNESS TRACKER—SE 3 can track your workouts in a healthy number of ways—from running and strength training to simply achieving your 10K steps a day. With real-time metrics and Workout Buddy powered by Apple Intelligence from your nearby iPhone,* you’ll hit your goals like never before.
- KEEP HELP CLOSE AT HAND—SE 3 is a smartwatch that can detect a hard fall or severe car crash and automatically help connect you to emergency services and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- WOMEN’S HEALTH INSIGHTS—SE 3 has advanced sensors that track your wrist temperature while you sleep. With this smartwatch, you can log your periods and symptoms, get period predictions, and get notified of cycle deviations.*
- GREAT BATTERY LIFE AND FASTER CHARGING—Enjoy a smartwatch with all-day, 18-hour battery life* from sunup to sundown. Then charge up to twice as fast as SE 2* and get up to 8 hours of battery in just 15 minutes.*
5. Reset the feature switch
If Unlock with Apple Watch is already enabled but does not unlock the phone, open Settings → Face ID & Passcode, enter the iPhone passcode, and turn the switch off for the affected watch. Restart both devices, return to that screen, and turn it back on. If the switch will not enable and the error returns, move on instead of repeatedly tapping “Try Again.”
Use other watch functions to narrow down the problem
Check whether the watch appears in the Watch app, receives notifications, can ping the iPhone, and can make or receive calls if that function is supported. If those work while iPhone unlocking does not, the failure may be limited to Unlock with Apple Watch or its authentication state rather than a total connection loss. However, normal Watch app communication does not prove that the specific unlock credential exchange is working.
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Reports of this feature-specific pattern include an Apple Community discussion and 9to5Mac’s coverage of early reports. These reports illustrate symptoms; they do not identify the cause of every current failure.
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![Apple Watch SE 3 [GPS 40mm] Smartwatch with Midnight Aluminum Case with Midnight Sport Band - S/M. Fitness and Sleep Trackers, Heart Rate Monitor, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/31Gq8SToFJL._SL160_.jpg)
- GET SMARTER HEALTH INSIGHTS—Apple Watch SE 3 is an advanced health tracker that helps you better understand your body. The smartwatch sends alerts for an irregular heart rhythm, or an unusually high or low heart rate.* You can view your overnight health tracking metrics with the Vitals app,* track your sleep score, and get sleep apnea notifications.*
- A GREAT FITNESS TRACKER—SE 3 can track your workouts in a healthy number of ways—from running and strength training to simply achieving your 10K steps a day. With real-time metrics and Workout Buddy powered by Apple Intelligence from your nearby iPhone,* you’ll hit your goals like never before.
- KEEP HELP CLOSE AT HAND—SE 3 is a smartwatch that can detect a hard fall or severe car crash and automatically help connect you to emergency services and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- WOMEN’S HEALTH INSIGHTS—SE 3 has advanced sensors that track your wrist temperature while you sleep. With this smartwatch, you can log your periods and symptoms, get period predictions, and get notified of cycle deviations.*
- GREAT BATTERY LIFE AND FASTER CHARGING—Enjoy a smartwatch with all-day, 18-hour battery life* from sunup to sundown. Then charge up to twice as fast as SE 2* and get up to 8 hours of battery in just 15 minutes.*
Unpair and pair the watch again
If the requirements, restart, updates, and switch reset have not helped, unpairing and re-pairing can clear a stale or corrupted pairing state. It is not guaranteed to fix the issue. Unpairing erases the watch, so make sure you know your Apple Account credentials and iPhone passcode before you start.
- Keep the iPhone and watch close together and open the Watch app on iPhone.
- Tap All Watches, then the information button next to the affected watch.
- Tap Unpair Apple Watch and follow the prompts. Unpairing creates a watch backup as part of the process.
- Pair the watch again. Restore from the offered backup, if available, and install a watchOS update if prompted.
- Once setup is complete, return to Settings → Face ID & Passcode → Unlock With Apple Watch and enable the switch.
Follow Apple’s instructions to unpair and erase Apple Watch. If restoring the backup does not help, setting up the watch as new can be a later diagnostic test; it is less convenient and is not a guaranteed remedy.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Test the feature correctly after setup
- Wear the watch, enter its passcode if needed, and keep it near the iPhone.
- Wake the iPhone while wearing a mask or the supported eye covering for which you need the feature.
- Look at the iPhone and swipe up after the watch unlocks it.
The watch should give haptic feedback and show an alert when it unlocks the iPhone. This feature unlocks the phone; it does not independently authorize Apple Pay, Keychain passwords, or password-protected apps. Some security events—including a restart, a prolonged period without passcode entry, or repeated failed biometric attempts—can also require you to enter a passcode before biometric unlocking is available again. See Apple Platform Security’s passcode and authentication guidance.
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![Apple Watch Series 11 [GPS 42mm] Smartwatch with Jet Black Aluminum Case with Black Sport Band - S/M. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/41s72HIk5TL._SL160_.jpg)
- A FULL-FEATURED HEALTH TRACKER—Apple Watch Series 11 gives you invaluable insights about your body, right from your wrist. Take an ECG anytime* and get alerts for a high and low heart rate or an irregular rhythm*—so you can stay closer to your heart. You can also view your overnight health tracking metrics with the Vitals app* and be notified of possible sleep apnea.*
- KNOW YOUR SLEEP SCORE—With advanced sleep tracking, Series 11 gives you a daily sleep score. It’s an easy way to help measure and understand the quality of your sleep, so you can make it more restorative.
- GET HYPERTENSION NOTIFICATIONS—Did you know that Series 11 can spot signs of chronic high blood pressure? By analyzing how your blood vessels respond to beats of the heart, it can notify you of possible hypertension.*
- SAFETY FEATURES—A smartwatch that puts your safety first. Series 11 can detect a hard fall or severe car crash, automatically help connect you with emergency services, and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- A POWERFUL FITNESS TRACKER—With advanced metrics and motivating features like Pacer, Heart Rate Zones, training load, and Workout Buddy powered by Apple Intelligence from your nearby iPhone*—Series 11 is made to help everyone stay active, from runners and hikers to strength-training enthusiasts.
If you mainly need to unlock while wearing a mask
For an iPhone 12 or later running iOS 15.4 or later, Apple offers Face ID with a Mask at Settings → Face ID & Passcode → Face ID with a Mask. It requires the eyes and surrounding area to remain visible and is not designed to work with sunglasses. Unlike Unlock with Apple Watch, Face ID with a Mask can also be used for app authentication and Apple Pay, subject to Apple’s usual security rules. See Apple’s Face ID guidance for wearing a mask.
Special cases and escalation
You recently changed iPhones
A watch moved to a new iPhone may still need to complete pairing, account authentication, or software updates. If your old iPhone is available, complete the transfer through Apple’s normal Watch migration process before treating this as a generic wireless fault.
The watch repeatedly locks while you wear it
Check that Wrist Detection is enabled and that the watch fits securely against your wrist. If the watch still locks while worn, or its sensors appear unreliable, contact Apple rather than disabling a security feature to work around the problem.
Contact Apple Support
Ask Apple Support to investigate if the watch will not stay paired, is missing from the Watch app, re-pairing fails, or the problem persists on current available software after a fresh pairing. Seek service sooner if the failure followed suspected liquid or impact damage, or if the watch has sensor or radio problems. Apple Support is available at support.apple.com.
A full iPhone reset, network-settings reset, third-party repair utility, or replacement device is not a sensible first response to this feature-specific message. Consider hardware replacement only if diagnostics establish a device problem or the hardware is unsupported or damaged.
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