Definition
This attribute indicates whether a phone number is usable for calling, as captured through Phone Banking Dispositions. By default all phone numbers are marked as "unknown” until the phone number is called during a phone bank or unless a phone number has been imported as “usable.”
Location
Contact > Phone Number
Note
This attribute is available for filtering in Community Builder and Organizer does take usability into account in Phone Banking. You can also view usability in Export by following this path: Contact > Phone Number > Usability.