The phone has a full-screen popup during setup to tell you all about it, and activating it uses an input people have been using on their phones for over a decade now - holding down the home button or gesture bar. That's one of the biggest improvements right off the bat: it's easy to summon Circle to Search.
Google Lens is accessible here as well. Once you've activated Circle to Search, you can tap the camera icon on the Google Search bar to summon Lens. I'm glad to see Lens isn't being forgotten, as it's much faster at getting results.
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