1. Sign up to your Twilio account.
2. Continue like this.
   
   
3. Then go to the Twilio console.
   
   1. Go to Phone Numbers.
   2. Then go to buy a number.
   3. Please select SMS from the filter.
   4. Then search.
   5. Then buy a number.
   
   
4. After that, go to the console page.
   
   
5. Get the credentials and add them to Settings > Setup > SMS Notification. 
   
   
6. You can send test SMS now by clicking on the Send test SMS button.

You have to Enable SMS from the SMS notification settings tab.

You change the SMS template from the SMS Templates tab.

If all of your credentials are OK, then you'll get an SMS like this: