• Some IoT cards (pure traffic cards) can obtain a 5G network on mobile phones, but
cannot obtain a 5G network on SIM820X; please replace ordinary mobile phone
cards that can make calls and send text messages to test.
Question:How to fix a specific frequency band?
Answer:
Specific frequency bands can be fixed by the following commands, here fixed at 41 and 78:
AT+CSYSSEL="nr5g_band",41:78
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