So the quick answer to this is that it works. If you add someone as a user through the normal process but use phonenumber@carrier then they will receive text messages when a post is made. However, you cannot reply via text, it gets rejected by Groups.io. I assume because it's missing all the email headers. You can, however, click on the "View/Reply Online" link and reply in a mobile web browser.
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On Wed, Jan 10, 2018 at 12:34 PM, Mike Vorkapich
<mvorkapich@...> wrote:
OK, thanks again. We may give it a try.