As of 19.4 it is possible to send a Live Leads or Email Campaign via SMS.  The SMS Campaigns screen only becomes visible when the 'SMS Campaign' role is enabled.  The role is a User level role that enables Users to see the SMS Campaign menu button under Communications>SMS Campaigns and the corresponding screen.  

If ticked as Manager the user can see all campaigns.  If not ticked as Manager the user can only see their own SMS Campaigns

Setting up the SMS Campaign role activates the SMS Gateway for the account so you must have a signed agreement to enable this role.  The role can only be set by AutoPlay employees.