GSM click is the easiest way to add GSM/GPRS communication to your device. The click features Telit's GL865-QUAD module. GSM click runs either on 3.3V or 5V power supply and communicates with the target microcontroller via UART interface.
It is possible to run an application from inside the module via the embedded Python Script Interpreter. Python is an easy-to-use programming language with clear syntax, and an interface that makes it simple to test small snippets of code.
The module has worldwide coverage - 850/900/1800/1900 MHz frequencies. GSM supports incoming and outgoing voice calls, sms and data communication (via GPRS)
In power saving mode, the GL865-QUAD uses around 1.5 mA, and in power off mode it uses less than 5 μA. That is considerably low and ideal for IoT devices that rely on long battery life and low power consumption.