Google's models work quite well on my Android phone. I haven't found a use case beyond generating shitposts, but the model does its job pretty well. It's not exactly ChatGPT, but minor things like "alter the tone of this email to make it more professional" work like a charm.

You need a relatively beefy phone to run this stuff on large amounts of text, though, and you can't have every app run it because your battery wouldn't last more than an hour.

I think the real use case for apps is more like going to be something like tiny, purpose-trained models, like the 270M models Google wants people to train and use: https://developers.googleblog.com/on-device-function-calling... With these things, you can set up somewhat intelligent situational automation without having to work out logic trees and edge cases beforehand.