A feature that allows users in the U.S. to participate in GroupMe chats via standard text messages, without needing the app or internet access.
Hi!
Welcome to the Microsoft Q&A forum.
This is a great suggestion. The best way to reach them is that you leave a feedback directly to GroupMe by opening GroupMe then go to Profile → Help → Feedback. This is the right channel to go to because you're asking to continue a feature, rather than reporting a technical problem.