GSM GPRS SIM900A Arduino Shield
The Shield connects your Arduino to the internet using the GPRS wireless network. Just plug this module onto your Arduino board, plug in a SIM card from an operator offering GPRS coverage and follow a few simple instructions to start controlling your world through the internet.
Product Link:
http://researchdesignlab.com/development-baord/arduino/gsm-gprs-sim900a-modem-compatible-for-arduino.html
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