• Register for Twilio and log in to the dashboard.
• Click on Get a Trial Number and get a number.
• Go to Admin > Settings > SMS Settings and set the Default SMS Gateway as Twilio.
• Copy the Trial Number Account SID and Auth Token and paste it into Admin > Settings > SMS Settings > Twilio Settings

 Trial Number will only send SMS to verified Twilio numbers. 

 To use this in a live production website, you will need to Upgrade your Twilio Account and make a purchase.