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This GSM Shield Sim900 provides you a way to use the GSM cell phone network to receive data from a remote location, it delivers GSM/GPRS 850/900/1800/1900MHz signals for Audio, SMS and GPRS Service.

This GPRS/GSM shield is configured and controlled via its UART using AT commands. Learn the basic usage of this Shied in Instructables.

If your project requires the use of both GSM and GPS,

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