I tried on iPhone, saw all the different apps that aren't Google, then re-read the announcement and saw that I should be able to see it in the Google app. So I load the Google app, but for the life of me I can't figure out how to access Gemini with it. Go online, find a news article with pictures, see that the 'switcher' above the Google logo does not appear for me, and then give up.

I can access it via gemini.google.com and I'm logged in to the iOS Google app as the correct account, no idea why I can't see the functionality on mobile. Oh well. Maybe I'll stick with OpenAI a while longer.