SMS Notification Settings allows you to notify or alert the Technicians through SMS. This way, the Technician can be notified on the go when the following is triggered:
The SMS notification will be sent only if the Custom Triggers and Notification rules are configured accordingly. The SMS can be sent at particular instances when the rules are satisfied. These rules can be set according to the Administrator's needs.
In Notification Rules, enable the checkbox 'Alert Technician by SMS when a request is assigned and 'Alert . This will ensure that the Technician is alerted by SMS when a request/change/problem is created/assigned to him.
Eg: Enable the following checkboxes for a 'Change' if Notifications have to be sent as SMS when a 'Change' is assigned/created :

The SMS Notification Settings is available under Admin > Apps & Add-ons. The SMS can be sent in two ways: