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Sim900 Gprs/gsm Shield Development Board Quad-band Module For Arduino Compatible With Uno Mega 2560 Raspberry - Integrated Circuits - AliExpress
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SIM900 GSM/GPRS Shield Interface with Arduino UNO -- Arduino GSM Tutorial - YouTube
Problem connecting Arduino Uno R3 to SIM900 GPRS/GSM shield and sending an SMS - #24 by leonhardo - Arduino GSM Shield - Arduino Forum
