We found an SMS provider that offers a trial account which enables us to send SMS from our SharePoint by calling their Web Services. It is Red Oxygen global SMS gateway (30 days trial)
Below are the steps in setting up and configuring the SMS alert:
- Obtain the root certificate for the SMS service provider's HTTPS Web address, which is https://www.redoxygen.net/oms/service.asmx. Open the URL using your browser and find out its SSL certificate. The certificate is issued by Go Daddy Secure Certification Authority.