To schedule an SMS campaign, click New campaign and choose SMS.
Select your recipients (make sure they've opted in to SMS), give the SMS a title for your own reference, and write your message — you can personalize it and insert tracked links.
Click Schedule at the bottom to set a future send time. The SMS is sent automatically at the scheduled time.
You can view scheduled campaigns under the Planned tab on the Campaigns screen.
To schedule an email instead, see Scheduling an email campaign.