I don't see text messages/calling in the skills/features list, or using any other messaging apps. Are there any particular plans to build skills for these sorts of applications?
Also, doe sit use whichever speech engine you have installed for tts? I'm interested in using this primarily because I only use FOSS and up until now I've been going without a voice assistant, but I do use flite tts.
Apparently uses Vosk for TTS.
Looks like it's welcoming of external contributors, a PR is in for telephone functionality. You could very likely get the functionality that you need included.