C-spire cell coverage is experiencing mass outage.
From their Facebook page:
We are currently experiencing technical issues including text messaging. Our team is working diligently to restore service as quickly as possible. iPhone users are still able to send messages via iMessage. We sincerely apologize for the inconvenience.
UPDATE 7:20 pm:
Our network team is making considerable progress. Please continue to stay tuned for additional updates. Again, we apologize for the inconvenience. We greatly value our customers, and we’ll continue to do whatever is necessary to resolve the issue. Thank you for your patience.