Help Center> IoT Device Access> FAQs> Device Integration> What Is the Meaning of "AT+CGDCONT=1, CTNB"?
What Is the Meaning of "AT+CGDCONT=1, CTNB"?
CTNB indicates the APN of the NB-IoT card on the device. Currently, NB-IoT cards do not support custom APNs. The APN must be obtained from the NB-IoT network service provider.
Parent topic: Device Integration
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