Accessing the modem's web UI can be useful to some users who want to check the settings of the modem. (i.e. configuring APN settings, enable/disable dual-stack and many others)
Here's a detailed walkthrough of how you can do that:
Begin by activating the proxy of the specific modem for which you wish to access the WebUI using a proxy browser extension or using Firefox, which has an embedded proxy component.
Launch your preferred web browser and enter either 192.168.1.1 in the address bar for MX2 modems or 192.168.8.1 for JL01 modems.
The modem's interface should promptly appear on the screen, providing you with access to its Web UI and configuration settings.