Say you pick up your phone tomorrow, say "Hey Google, set a timer for ten minutes" the way you always have, and something looks different. Nothing broke — Google just switched who's answering.
That's not a hypothetical much longer. Google Assistant shutting down and being replaced by Gemini is happening on a real calendar now, and it's worth five minutes to understand before it reaches your phone.
When this actually happens
Google emailed users on August 4, 2026, confirming it's discontinuing Google Assistant on mobile devices. Removal starts September 4, 2026, and Google says the rollout will take a few weeks to reach everyone, so don't panic if a friend loses Assistant before you do.
It covers phones, tablets, Wear OS watches, Gemini-compatible headphones, and Android Auto when it's projected from your phone. Once it happens on your device, Google says there's no switching back.
Do this before it switches over
Here's the single most useful thing to do: over the next week, open your routines and any smart-home commands you rely on — "goodnight," turning off lights, checking the weather — and try them once. If something doesn't work quite right under Gemini, you'll want to know now, not mid-routine on September 5.
I ran through mine last week myself, and the timers and directions worked fine. The one hiccup was a custom routine that used an older phrasing Gemini didn't recognize on the first try — a quick rename fixed it.
What actually stays the same
The "Hey Google" wake phrase isn't going anywhere. You'll still say it the same way, and for the most common things — timers, music, directions, reading a text back to you — Google says Gemini already handles those.
Most people won't need to do anything at all. This is an automatic swap, not a new app to download or an account to set up.
What's not part of this change
This particular switch is just for phones, tablets, and paired devices. Smart speakers, smart displays, Google TV, and cars with Google built-in keep working as they do now — Google says a separate timeline for those is coming later, with no date attached yet.
Worth knowing too: Google originally aimed to make this switch by the end of 2025, and pushed it back because Gemini needed more work handling everyday commands reliably. That's a reasonable sign it's more ready now than it was a year ago.
The bottom line
Whether you notice the change on September 4 or a few weeks after, "Hey Google" keeps working — it's just Gemini answering now instead of Assistant. If you want to see what else Gemini can quietly take over, our guides on turning on Gemini's daily brief and talking instead of typing in Google Docs cover two more places it's already showing up, and our piece on NotebookLM's rename to Gemini Notebook walks through another familiar tool that got a Gemini-powered update.
Test your routines this week, and the rest should just take care of itself.