Why would you want to use this option? Well if you are sure that all the phone numbers you have are on DND, you might opt for this option. Simply tick the DND management option 3 and then click send. Your messages will be delivered to phone numbers that are on DND and phone numbers that are not on the DND service as well at two units per page of SMS.
So give it a try the next time you want to send your messages and you want it delivered to your recipients that are on the DND list.
Please watch the video below for a visual Aid.