Hi. Im searching an GPRS/GSM shield for arduino and I saw there are two populars. Sim900 manufactured by IC ( http://www.amazon.com/SIM900-GSM-GPRS-Shield-Arduino/dp/B0068EOUEE/ref=sr_1_1?ie=UTF8&qid=1348703158&sr=8-1&keywords=sim900 ) or SM5100B by Sparkfun ( https://www.sparkfun.com/products/9607 ). …

Which GPRS module should I buy?

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