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Siemens M20T module is good GSM module for SMS sending, but it isn't able to receive all types of SMS. It is connected to the standard serial port, additional configuration not needed. It is not necessary to install any other drivers or programs.

WARNING! This module is being supplied in two variations:

• M20 - industrial module without serial port, for standard user's usage with MobilChange not suitable
• M20T (terminal) - with the serial port, suitable for MobilChange

Driver is quite sensitive for firmware version. About firmware versions and their settings please read here. If you have got the 1.x firmware class, it's a need to upgrade it to the current version (at least 2.2). Please contact your supplier of the module.