I've run qwen3 4B on my phone, it's not the best but it's better than old gpt-3.5. It also does have a reasoning mode, and in reasoning mode it's better than the original gpt-4 and rhe original gpt-4o, but not the latest gpt-4o. I get usable speed, but it's not really comparable to most cloud hosted models.
I'm on android so I've used termux+ollama, but if you don't want to set that up in a terminal or want a GUI pocketpal AI is a really good app for both android and iOS. It let's you run hugging face models.
