How can I use my iPhone to unlock my watch?

If you forgot your Apple Watch passcode

1. Put your watch on its charger and keep it there until you complete these steps.
2. Press and hold the side button until you see Power Off.
3. Press and hold the Digital Crown until you see Erase all content and settings.
4. Tap Reset, then tap Reset again to confirm.

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If you forgot your Apple Watch passcode - Apple Support