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Has anyone tried GSM/GPRS and/or CDMA (cellular) wireless modems for RTU, SCADA, or general telemetry applications? I am currently looking into Multi-TECH's MultiModem GSM/GPRS and MultiModem CDMA external data/fax/voice wireless modems and it almost seems too good to be true. The operational cost might prove challenging, but I believe both the implementation and technical simplicity/flexibility——from the PLC/RTU/SCADA side——merit a hard look.