Helpdesk can be configured to send out sms notifications.
You should have account on www.twilio.com.
Get your Account SID and Auth Token by login at https://www.twilio.com/login then go to Settings
Step 1
Navigate to Administration > SMS(in Notification section)
Step 2
Specify Account SID, Auth Token, From# and Notifications options
Template
You can update SMS Notification template in the Shared.resx (\DesktopModules\LiveHelpdesk\Views\App_LocalResources\)
For Example:
Suppose you want to update issue created via Form (Agent Template) then update the Agent_IssueCreatedViaForm.Body field. Similarly if you want to update for User Template then it would be User_IssueCreatedViaForm.Body field.
Note: Refer to Tokens available for the notification templates.