Android users have been able to use their phones as Google security key for a while now, and now Google is finally making good on the promise to bring the same functionality to the iPhone. An update to the Google Smart Lock app this week turns your iPhone into an honest-to-goodness FIDO2 key, using the Secure Enclave to skip SMS and keep your accounts safe.

It only works with Google accounts so far, but it’s a great tool for security-minded users. Instead of relying on one-time passwords delivered over SMS, you’ll be able to use your iPhone to log into your account on another PC, Mac, or iOS device quickly and securely without spending money on a separate hardware key. This method doesn’t work on Android phones and any browser activity will need to be done using Chrome. Any iPhone with a Secure Enclave will work, which is any phone after the iPhone 5S. (It’s unclear if the iPhone 5S supports the feature, as it packs a Secure Enclave but doesn’t support iOS 13.)

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