Huawei B315 LTE CPE Quick Start Quide page 11

You can connect the router to a wall-mounted Ethernet port using an
Ethernet cable to connect to the Internet when you have used up your data
allowance.
Configure the relevant settings on the web-based management page before
connecting to the Internet through an Ethernet port. More information can
be found in the help section of the web-based management page.
4. Downloading Huawei HiLink
Scan the above QR code to download the Huawei HiLink app and configure
the router from your phone.
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