Apple Watch Error Code 10: How to Fix It

Easy 15-30 minutes Medium Severity Verified June 2026
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Error Code
10
Brand
Apple Watch
Product Type
wearable
Severity
Medium
DIY Difficulty
Easy
Estimated Fix Time
15-30 minutes
Apple Watch Error Code 10 indicates that the 'Unlock with Apple Watch' feature has stopped working, meaning your Apple Watch can no longer automatically unlock your iPhone when you're wearing a mask or in situations where Face ID can't fully scan your face. This is a software-level issue typically caused by a misconfiguration, outdated software, or a broken link between your Watch and iPhone pairing. The good news is that this problem is almost always fixable at home without any special tools or technical expertise.
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Tools You'll Need

How to Fix Error Code 10

  1. Check Basic Requirements Are Met

  2. Toggle 'Unlock with Apple Watch' Off and Back On

  3. Restart Both Your iPhone and Apple Watch

  4. Update Software on Both Devices

    Keep your Apple Watch on its charger during the update process. Do not remove it until the update is fully complete to avoid software corruption.

  5. Sign Out of iCloud and Sign Back In

    Signing out of iCloud temporarily disables Find My iPhone. Make sure you remember your Apple ID and password before proceeding.

  6. Unpair and Re-Pair Your Apple Watch

    Unpairing will remove the watch from your iPhone. All data will be backed up automatically, but confirm the backup is created before proceeding by watching for the backup confirmation message.

  7. Reset All Settings on iPhone (Last Resort)

    This step resets all system settings including Wi-Fi passwords and VPN configurations. You will need to reconnect to Wi-Fi networks manually after the reset.
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When to Call a Professional

Contact Apple Support or visit an Apple Store if Error Code 10 persists after completing all steps including unpairing and re-pairing your Apple Watch. You should also seek professional help if your Apple Watch is not recognized by your iPhone at all, if Face ID itself is malfunctioning (not just the Watch unlock feature), or if your device is still under AppleCare+ warranty and you prefer a hardware inspection. Apple Support can also remotely diagnose pairing and authentication issues that are not resolvable through standard troubleshooting.

Frequently Asked Questions

Why is my Apple Watch not unlocking my iPhone?
Apple Watch Error Code 10 usually occurs because the 'Unlock with Apple Watch' feature is disabled, your software is outdated, or the pairing link between the two devices has broken. Start by going to Settings > Face ID & Passcode on your iPhone and making sure 'Unlock with Apple Watch' is toggled on. If it is already on, try toggling it off and back on, then restart both devices.
What iOS and watchOS versions are needed for Apple Watch to unlock iPhone?
You need at least iOS 14.5 on your iPhone and watchOS 7.4 on your Apple Watch for the unlock feature to work. Additionally, your iPhone must support Face ID, meaning it must be an iPhone X or later model. Check your software versions under Settings > General > About on your iPhone and in the Watch app under My Watch > General > About.
Does the Apple Watch unlock iPhone feature work without a mask?
The 'Unlock with Apple Watch' feature was specifically designed to help when Face ID cannot complete a full scan — such as when wearing a face mask. If you are not wearing a mask, Face ID should unlock your iPhone directly without needing the Apple Watch. If Face ID is failing without a mask, the issue may be with Face ID itself rather than Error Code 10.
Will unpairing my Apple Watch delete all my data?
No. When you unpair your Apple Watch from your iPhone using the Watch app, the iPhone automatically creates a backup of your Apple Watch data before unpairing. When you re-pair the watch, you can restore from that backup to recover your apps, settings, health data, and workout history. Just make sure to wait for the backup confirmation message before completing the unpair process.
Can Apple Watch Error Code 10 be caused by a hardware problem?
In most cases, Error Code 10 is a software issue and not a hardware problem. However, if your Apple Watch has suffered physical damage, particularly to the internal sensors or Bluetooth hardware, it may affect its ability to communicate with your iPhone for the unlock feature. If all software troubleshooting steps fail, take your device to an Apple Store for a hardware inspection.

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