Arduino gsm shields for wireless communication arduino a000106 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 a connector for an external aerial another version is available which has an on board aerial 73