I use the AI app that came with my laptop which is CoPilot. I think that's the Microsoft AI app. I have a smartphone but i hate the thing and rarely use any apps with it. I was happy with my flip phone until Spectrum fiber optic became available in my area and I save money by bundling TV, internet, and mobile. If it weren't for that, I'd probably go back to my flip phone. The smartphone does nothing to make my life easier. CoPilot is useful but I wouldn't bet on the accuracy of its answers.
Grok is my go-to for Ai. I do like my smartphone but the vast majority of my internet time is spent on my laptops. I don't bundle anything. My internet and mobile are from the same provider but they don't offer a bundle for the two. I haven't had subscription TV for 21 years now. My TV got turned on a month ago after being off for 3 years. I have movies on thumb drives that the grandkids watch. They were watching YouTube on it before we shut it down 3 years ago. I also have Amazon Prime but I 've only watched a half dozen movies from it in the last 4 years and that is on my laptops. I watch a lot of documentaries and such on YouTube. The smartphone does make my life easier. It's convenient.