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GSM module and microcontroller
The GSM module is definitely not just an integrated block, it is a whole circuit board. For this kind of mobile phone, this module is basically all that is left after removing the casing, battery, buttons and display. It is recommended Don't tear it apart.
Find the serial port of this mobile phone, connect the serial port to the serial port of your microcontroller, and issue AT commands through the serial port.
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