In fact GSM shield is called SM5100B Cellular Shield. So this project is simple – programming Arduino to send text messages, dial the number. Tutorial goes step by step how to connect Cellular shield to Arduino mega and communicate to it by using newsoftserial Arduino library. Whole process steps are monitored in terminal window, so it is easy to follow whats going on during each step of program run.
In the end you will see that using cellular shield is really easy – you can send text messages or make a call by sending couple AT commands. It seems that there will be more info on that, so keep an eye on it.