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Gboard is a unique Arduino board which features a SIM900 GSM/GPRS module, an XBee socket, nRF24L01+ module interface and an ATMega328P controller. This board will add wireless XBee / nRF24L01+ control as well as GSM/GPRS connectivity to your projects. It’s great for anything from home automation to robot control. The possibilities are endless!
This module comes with a GSM antenna (Long & SMA Plug Right angle)
SIM900 AT Command Manual
TinyFAT Arduino Library
SIM900 Arduino Library