The D-Link DWM-222 USB modem is being detected as a USB storage device. Like various other cellular and wifi USB devices, there may be Windows drivers pre-loaded in a partition that appears as a CD for ease of installation.
First, find out the vendor ID and product ID of the D-Link USB modem, either by looking in the Kernel Log (dmesg) or by running lsusb in SSH.
Second, for usb-modeswitch to work, confirm that the vendor ID and product Id is in the /etc/usb-mode.json file.
I do not work for and I am not directly associated with GL.iNet