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.
Who can use this feature?
System Administrator | Owner
Instructions
Navigate to Modules and on the Site Tools tab, select Subscriber Management
Click Remove SMS Number at the top of the page
Enter the phone number to remove
Click Remove SMS Number
View the pop-up that says "The number has been removed from the system"