Old phone as voice control?

New to home assistant. With the new companion app setting to allow for home assistant to become the default voice assistant, could i use old phones around the home and set them up as local voice control systems? This way i can keep my main cell as hey google but have local hey Nabu in the home? Does this make sense?

It makes sense and I’m planning to do the same, remember it’s Android only.

they hey Jarvis command only opens up a text box. How can I integrate into the
phone a direct to voice command?