Here is the Seeedstudio GPRS shield: http://www.seeedstudio.com/depot/gprs-shield-p-779.html?cPath=132_134 The wiki page says "Make sure your SIM card is unlocked". http://www.seeedstudio.com/wiki/index.php?title=GPRS_Shield_v0.9b What does unlocked SIM card mean? Does one have to get some speci…

Seeedstudio GPRS shield question

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