Pretty sure your phone assistant isn't using their best model. It's probably using one of the old flash models no?
When you ask stuff in your car on android auto it uses 3.5 flash-lite. The response details would include it in the logs.
Flash lite is very noticeably more idiotic than 3.8 Flash. It's why the quick AI overview is often much worse than the AI mode one.
As an android user, this worked perfectly like 10 years ago.
The model used is irrelevant when there's the critical issue where their "AI" assistant can't understand the word "nearest". Literally worse than a second-grade understanding of English.
I also have had shockingly bad results with gemini on android. Ended up giving up on it after a few months. Silly silly google with their trademark UX polish and attention to usability.