EG800Z-CN AT+CNUM support

Hello.

I am testing the EG800Z-CN module by mounting it to the AP board via ECM USB for our product development.

I confirmed that LTE communication works after inserting the USIM registered with the carrier, however entering AT+CNUM returns an ERROR. The phone number is clearly written on the USIM, I suspect that the AT+CNUM command was not implemented. Please let me know if there is a command that can replace this, or is the firmware version too old?

ati
Quectel
EG800Z
Revision: EG800ZCNLAR07A07M04