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TTGO T Call V1.4 ESP32 Wireless Module SIM Antenna SIM Card SIM800H Module Unsoldered 160mm Aluminium CPU Heatsink Mornsun LMF75 23B48 Power Supply Unit Mornsun LMF75 23B48 Power Supply Unit and gas sensors without additional circuit design It cannot connect to 3G Use the UART serial monitor at 115200 baud rate to debug AT command responses and troubleshoot connectivity issues
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