We are aware of an issue that occurred over the weekend that stopped SMS messages being sent out. We have since corrected the issue but the SMS will need to be re-sent. Below is a step by step guide on how to resend the SMS messages.
1) Main Menu of R4
2) Select Edit and Task Scheduler
3) Find the SMS task in the list
4) Highlight the task and select Edit Task
5) Use the appointment date range section to specify the dates to send
6) Select "preview appointments"
7) Select "send reminders now"
8) Select "close" and don't save