SIM300 hardware circuits and application notes (in English), including English: SIM300 schematic diagram, the order on the hardware. Chinese: detailed instructions, how to connect, how to transfer data. I personally collated

SIM300硬件电路及应用说明（中英文版）
....................................\sim300资料（中文版）应用讲解.rar
....................................\sim300资料（英文版）硬件电路及命令讲解.rar

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