Arduino gsm shields for wireless communication arduino a000105 send and receive sms messages from your arduino with the gsm shield 2 or make and receive phone calls or even surf the net plug this neat little board into your arduino add a sim and you are ready to begin the board is open source giving you acces to the schematics and its free gsm software library this version of the board has an on board aerial another version is available which has a connector for an external aerial 73