Connect to the module's AT port at the correct baud rate (usually 115200). Enter AT to confirm the connection (should return OK ). Execute the command: AT+EGMR=1,7,"123456789012345" If successful, the module returns OK .
To send these commands, you must connect to the module's using a serial communication tool like PuTTY, MobaXterm, or Quectel's proprietary tools. quectel change imei
AT+CGSN