LWM2M_CARRIER_LG_UPLUS_DEVICE_SERIAL_NO_2DID

#define LWM2M_CARRIER_LG_UPLUS_DEVICE_SERIAL_NO_2DID   1

#include <lib/bin/lwm2m_carrier/include/lwm2m_carrier.h>

Use the the two-dimensional barcode etched on top of the module as the serial number for identification in the LG U+ network.