Restaurant Manager Plugin version 1.2.2 and above needed – https://wordpress.org/plugins/restaurant-manager/
Now you can send and SMS directly to your customer with our Customer SMS extension. Send those important last minute updates or any information which you need to get to your customer on the move. All SMS is recorded in the restaurant manager plugin. You are able to see all the messages sent to your customer and from the staff member who wrote the message at that time.