Google will now let you use your Android phone as a physical security key
 

Interesting idea, but almost useless at this time because of the availability of the Google prompt when logging into Gmail. I already was using the Google prompt on my phone, which works without Bluetooth. Bluetooth is so unreliable I would hate to use it for 2FA. In fact, today I tried the new setup on my Android phone. It wouldn't work when I tried to login to Gmail at work. I reverted to using the authenticator app. No matter what I do I can't pair with the Bluetooth on my work computer--it never shows up as an available device on my phone. I have had similar problems with other Bluetooth devices.

Well that’s convenient since I always have my phone. Going to try this out. Would be great if I could also use this for my banking, AWS and other critical accounts.