Apple relies on proximity and other cues to let a Watch, iPhone, and Mac unlock each other without requiring additional authentication.

Your Apple Watch can do more than track your fitness activities and sleep habits, assuming you know how to sync it with your Mac. Here's how.

Step 1: Set up Two-Factor Authentication on your Mac Before you can use your Apple Watch to unlock your Mac you’ll need to set up Two-Factor Authentication on your Mac or your iOS device.

Now, whenever your Apple Watch is within a few feet -- or about 1 meter -- of your Mac, the Mac will automatically unlock, rather than waiting for you to type in your password.

You can also use your Apple Watch to keep your iPhone unlocked. Go to the Face ID & Passcode section of Settings, enter your passcode, and turn on the toggle for Unlock with Apple Watch.

Given that enabling an Apple Watch passcode is one of the requirements of Unlock With Apple Watch, it's worth turning this setting on and off again to see if it triggers something.

Instead of tapping out your PIN code on the way-too-small number pad, here's how you can use your iPhone to unlock your watch.

On Apple Watch, there's an option in watchOS that lets your iPhone unlock your watch as long as the ‌iPhone‌ is unlocked (Settings -> Passcode -> Unlock With iPhone). Enabling this option ...

Select it, enter your passcode and scroll down to the Unlock with Apple Watch section. If you have a watch registered under your Apple ID, you'll see it listed here.

If you have an iPhone and an Apple Watch, you can use them together to unlock each other. Here's how to set it up and use it. A simple step-by-step guide.