The maximum power consumption of SIM900 is around 2.5W, but it can be as low as 1.5W in idle mode.
You need to use AT commands to configure the SIM900. For SMS, use AT+CMGF=1 to set the SMS format to text mode, and AT+CMGS=<recipient phone number> to send an SMS. For GPRS, use AT+SAPBR=3 to set the GPRS bearer, and AT+CGATT=1 to attach to the GPRS network.
The maximum data transfer rate of SIM900 is around 85.6 kbps for upload and 171.2 kbps for download.
You can reset the SIM900 to its default settings by sending the AT command AT&F.
The operating temperature range of SIM900 is -40°C to +85°C.
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