Login to your Salesforce org where the package is installed.
...
FIND {0} IN ALL FIELDS RETURNING Contact(Name, Id ORDER BY LASTMODIFIEDDATE DESC LIMIT 1) LIMIT 10
(Change Object Name in Query as per requirement)
Now, Go to Custom Settings and Click on Manage of “Features Entitlement“.
Mark the checkbox true for SMS and eFax.
...
Go to SMS and eFax App from App Launcher
Go to SMS Number - User Mappings tab and click on New.
For SMS Registered #, Click on New SMS Registered #,
...
Enter the details as shown :-
...
the number and Save.
...
Map the user and Click on Save.
...
Update SMS Templates:
Go to SMS and eFAX Application.
Go to SMS Templates tab.
Click on New
...
Enter the details as shown in below picture.
...
Click Save.
Congratulations! You have successfully installed the Application.