Configuration profiles can be deleted by clicking on the Delete button for the appropriate profile on the Legacy Cellular Configurations page. A confirmation pop-up will ask you to confirm that you wish to delete the configuration profile. If there are any devices linked to the configuration profile that is being deleted, those devices will remain in ARMT, but they will not have a configuration profile associated with them.  After the configuration profile is deleted, you must associate the device to a new configuration profile if you want the device to get a configuration from ARMT.