What does the Arduino GSM Shield 2 do? It allows the Arduino board to connect to the internet, as well as making, receiving voice calls, also sending and receiving messages. The shield also uses a radio modem M10 by Quectel, and of course using AT commands, it becomes capable to communicate with the board. The types of digital pins used are 2 and 3 for the software serial communication with M10. That is convincing enough isn’t it, so whether you’re in UAE, Oman, or Qatar make your choice and enjoy!