If you’re having trouble sending an SMS, first make sure your phone has a signal. Then powercycle your device by holding down the power button until it turns off, wait 30 seconds, and then turn phone back on. If powercycling your phone did not work, then reach out to the Mediacom Mobile Customer Care Team at 855-699-6655. They’ll assist you in troubleshooting any network-related issues affecting your SMS functionality.