RM520N-GL 5G modem

We are using the RM520N-GL 5G modem, which by default uses the qmi_wwan driver. When connecting to the internet with a 4G SIM card on Ubuntu 20.04, why does running ifconfig show ppp0 instead of wwan.
I think it should show “WWAN”,right?
Actually ,the internet is connecting ,but the “ppp0” message is very strange.

Additionally, how can I send AT commands to the RM520N-GL modem in Ubuntu?

In the PCP_B465_defconfig, after adding the following codes:

CONFIG_USB_NET_QMI_WWAN=y
CONFIG_USB_WDM=y

An interface wwan0 was generated after running ifconfig. However, two drivers, option and qmi_wwan, were also added. Is this correct?

The generated ports are: ttyUSB2 (at), ttyUSB3 (at), cdc-wdm0 (qmi), and wwan0 (net)."

Dear @Mei_Wang
You can try as below:
ls /dev/ttyU*
busybox microcom /dev/ttyUSB2

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