The phone number that you registered with allows you to activate Boss Mode.
Text the word "Boss" to your Next In Line (nil) number. Doing so, turns on the ability to manage your wait list through SMS. No need for a computer, data, wi-fi or a smart phone.
From here, there are are few options -
Next = Welcomes the next guest in line
Wait = Turns the waiting list off or on
Serve = Turns the serving list off or no
Count = Returns the number of guests in line and in service
Goodnight = Removes everyone from wait list and serving and turns lists off
Boss = Turns Off Boss Mode