SMS marketing campaign from Zoho CRM

Hi Zoho team and followers of this exciting group of products!
Referring only to Zoho CRM, what is the easiest way to send SMS marketing campaign from Zoho CRM? If it is not possible yet, than what tools can be used from other providers of SMS messaging that can be integrated into Zoho CRM and in that way have only tracking of SMS campaign through Zoho CRM.
Thanks for your attention,
Marko