In this Instructable, you will learn how easy it is to send and receive SMS messages over GSM with Arduino.
One of the essential elements of building IoT project is the ability to connect devices. Wi-Fi and Bluetooth are good low cost choices, but they work only at close ranges, or in hotspot areas. When the device needs to be at a remote location GSM is a good and easy to setup option.
Send and Receive SMS with GSM SIM900 Arduino Shield – [Link]