How To Restore Apple Watch Series 3. However being able to erase and reset an Apple Watch without access to a paired phone is also possible and heres how. The Apple Watch Series 3 does not have a restart option as such you need to turn it off and on again.

Youll need to put your iPhone and Apple Watch close throughout. Watch series 3 cellular watchOS 521. IOS 146 rather than recommending users to free up space by deleting content and apps is now telling users to just unpair their Apple Watch and then re-pair it to their iPhone.
If you want to pair your Apple Watch and iPhone again keep your plan.
But you can restore from a previous back up. On your Apple Watch tap Settings General Reset Erase All Content and Settings. Tap Unpair Apple Watch. TV 4th Gen tvOS 123.

