1. Because you can

We all know the feeling. You’re out and about, iPhone in hand, and you want to check something quickly. But your phone is locked, and you don’t have time to fumble around with the passcode.

If you’ve got your Apple Watch on, however, unlocking your iPhone is a breeze. Just double-click the side button and hold the face of your watch up to the Face ID sensor on your iPhone, and voilà — you’re in.

2. It’s more secure than using your passcode

While passcodes are certainly better than nothing, they’re not the most secure way to protect your iPhone. That’s because passcodes can be guessed, and they can be shared.

On the other hand, your Apple Watch is linked to your iPhone using a secure, encrypted connection. And only you can unlock your Watch using your passcode. So when you use your Watch to unlock your iPhone, you’re getting the best of both worlds — the convenience of Face ID with the security of a passcode.

3. It’s faster than Face ID

Face ID is pretty speedy, but it’s not as fast as using your Apple Watch to unlock your iPhone. That’s because you don’t have to wait for Face ID to recognize you — you can just hold your Watch up to your iPhone and be on your way.

4. You don’t need to take your iPhone out of your pocket

This one’s a no-brainer. If you want to unlock your iPhone using Face ID, you’ve got to take it out of your pocket or bag first. But if you use your Apple Watch, you can leave your iPhone right where it is.

5. You can use it even if you’re not wearing your Watch

If you don’t have your Watch on, you can still use it to unlock your iPhone — as long as it’s close by. Just wake your Watch by tapping the screen or pressing the side button, then hold it up to your iPhone. Your Watch will unlock your iPhone, even if it’s not on your wrist.

6. You can use it when your iPhone is in your bag or pocket

Face ID works great when your iPhone is in your hand, but it doesn’t work so well when it’s in your bag or pocket. The good news is, you can use your Apple Watch to unlock your iPhone even when it’s out of sight.

7. You can use it when your hands are full

We’ve all been there — you’re carrying a bunch of stuff, and you want to check your iPhone, but you can’t because your hands are full. With your Apple Watch, you can just double-click the side button and hold the face of your Watch up to the Face ID sensor on your iPhone, and you’re in. No muss, no fuss.

8. You can use it when you’re wearing a mask

Face ID doesn’t work when you’re wearing a mask, but you can still use your Apple Watch to unlock your iPhone. Just double-click the side button and hold the face of your Watch up to the Face ID sensor on your iPhone, and you’re in.

9. You don’t have to worry about battery life

One of the best things about using your Apple Watch to unlock your iPhone is that you don’t have to worry about battery life. Even if your Watch is running low on battery, it will still be able to unlock your iPhone.

10. It’s just plain cool

Let’s be honest, using your Apple Watch to unlock your iPhone is just plain cool. It’s the kind of thing that makes you feel like a secret agent or a superhero. And who doesn’t want to feel like that?