So what does this mean for Google Voice and Google Fi users? All my SMS runs through Hangouts.
Google Fi will be unchanged; I've been using Messages from the beginning. Voice, however, has a much better experience with Hangouts than with the standalone Voice app, and in particular the standalone Voice app doesn't let you make VoIP calls as far as I can tell.
There may be a more fundamental question here.
https://support.google.com/fi/answer/6188337?hl=en&ref_topic...