If you're sending a campaign that requires a reply or action from the contact, this feature is perfect for controlling the rate of responses.
Set the send speed
You can set the send speed on the Send campaign page while you’re creating a campaign.
We divide the campaign's audience into 100-contact blocks, and then gradually send the campaign to each block over the time you choose. Therefore, to spread a send, you must send the SMS campaign to a minimum of 100 contacts.
You can use the default sending speed, meaning as soon as possible, or spread the campaign send out over 1, 2, 3, 6, 12 or 24 hours.