OMS SMS Gateway
You can send long SMS message to specified phone number(s) via Microsoft Office Mobile Service (OMS). You have to subscribe to a Text Message (SMS) Service from a Service Provider. You can find a list of Service Providers here .
In case you want to use OMS as communication type, check the “OMS SMS Gateway” box in the settings when you create new communication.
Then fill enter OMS server Url, user name and password given by OMS provider.