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We will use the Arduino software serial library in this tutorial, and the Link sprite shield has hard-wired the serial from the SIM900 to a set of jumpers, and Learn about SIM900 GSM GPRS Shield along with its Pinout, Antenna & Power Supply Selection, Wiring, AT Commands & Code for Sending & Receiving Call & SMS.The Arduino GSM Shield allows a n Arduino board to connec t to the internet, make/receive voice calls and send/receive SMS messages. The Shield uses a. To read incoming SMS, upload the code below to your Arduino. After uploading, wait 20 seconds for the shield to establish communication. Then, test the script GSM SHIELD. QUICK START. GUIDE click "Activate SIM" enter your SIM number purchase some credit insert your SIM card into the GSM shield. GSM Shield Datasheet Arduino Tutorial. but also can use the digital pin (D6) of Arduino to power on and reset (D5) the SIM900 module.