The SMS tab of the DNC editor displays the DNC list for the phone numbers for which SMSes are sent. Phone numbers are verified immediately before sending an SMS. If the phone number is in the DNC list, the SMS is not sent to the consumer except for the Opt-In template. Navigate to Configure > Contacts > DNC > SMS tab.

Double-clicking on the SMS DNC list record allows you to update the Contact Group, Expiration Date, and Phone Number.