They have their own dedicated physical button for Bixby, although Samsung has yet to release the voice command feature for its virtual assistant. (news.softpedia.com)
The new voice assistant is such a big part of Samsung's new phone that it even had its own dedicated physical button. (ibtimes.com)
Bixby is Samsung's answer to the slew of virtual assistants coming in from various competitors, and the Galaxy S8 and S8 + are the first devices to preload this smart and contextual assistant and even dedicate a physical button to it. (xda-developers.com)