Here are the different options for how to enable SMS on your GpsGate Server. SMS is typical used for sending commands to GPS trackers or to send notifications and messages to users. If you don't need that you don't need SMS.
Using multiple SMS providers This new feature will let you categorize SMS providers for different applications and geographical locations. This way, you can let the system pick the most advantageous provider based on the recipient phone number. http://gpsgate.com/blogComment/configuring_sms_providers
Developers only: Integrate using .NET (Difficult, not recommended) If you are a developer and want to integrate other providers of SMS, please take a look at the class "GpsGate.Client.SmsProxyClient" in "GpsGate Tracking Client SDK" http://gpsgate.com/go/gpsgateserver/download.asp