That's the soft-token authenticator I was alluding to earlier. It's like Google Authenticator. It generates a code on your phone and asks you to essentially replicate the number you're getting on your app and put it in. Instead of getting a text message, you're using that number. You can also use a hardware token. Some people might have seen those RSA keys that generate a number as well. A hardware or soft token could be used to authenticate. Essentially, you just don't want to tie it to your phone.
On March 12th, 2020. See this statement in context.