This article will show you how to remove a Phone (SMS) Number associated with a subscriber to your site. You can only remove the SMS numbers of an Inactive Subscriber. 

Instructions    

1. Navigate to Modules > Site Tools > Subscriber Management
   
   
2. Click Remove SMS Number at the top of the page
   
3. Enter the phone number to remove
   
4. Click Remove SMS Number
   
   
5. View the pop-up that says The number has been removed from the system