You can hit that button if you have Bixby call screen activated, and it will answer the call for you, and transcribe what the caller is saying, then give you options of what you'd like Bixby to say in return... you have multiple options of what to say if you want to mess with someone like a spammer, and if it's a spam caller you can have Bixby politely tell them to bugger off and hang up on them. Then you have the option to block the number. You can also type in your own message if you're feeling froggy
It's very similar to Pixels call screening feature. It's a blast to mess with spammers
That button doesn't have anything to do with the Bixby "answer phone" feature though, that's a separate feature you have to activate individually. I don't remember at the moment where it's located but type in "Bixby wakeup" in the settings search bar and it should come up.
The call screening feature is under the phone settings I believe, and the handsfree answer might be as well, but for some reason I thought it was somewhere else
Either way I'm using both and they're great
