The simplest solution would be to replace your WiFi Mini EE router with a 4G LTE router which has multiple gigabit Ethernet ports.
A workaround would be to obtain a device which can connect to your current router and act as an Access Point (with WiFi backhaul) but this configuration is more complex and has higher latency with a WiFi hop.
Alternatively, you may enquire with the manufacturer as to their recommended workaround as they may have a device-specific workaround such as to add an accessory or another of their devices as an intermediary.
The USB port provides a quasi-Ethernet connection.
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To phone EE CS: Dial Freephone +44 800 079 8586 - Option 1 for Mobile Phone & Mobile Broadband or Option 2 for Home Broadband & Home Phone
ISPs: 1999: Freeserve 48K Dial-Up > 2005: Wanadoo 1 Meg BB > 2007: Orange 2 Meg BB > 2008: Orange 8 Meg LLU > 2010: Orange 16 Meg LLU > 2011: Orange 20 Meg WBC > 2014: EE 20 Meg WBC > 2020: EE 40 Meg FTTC > 2022:EE 80 Meg FTTC SoGEA > 2025 EE 150 Meg FTTP
A WiFi extender is a possibility where the WiFi extender would connect via WiFi to your router and then function as an Access Point for further WiFi and wired devices.
I would usually only prefer this option if you own a WiFi extender already for whatever reason. The WiFi hop between the router and the WiFi extender adds latency and jitter so it's not really a long-term or production-ready solution unless your demands are quite low.
If you find the audio quality to suffer, that would be a sign that you need to look into other options.
@XRaySpeX wrote, The USB port provides a quasi-Ethernet connection.
In my experience the USB as an Ethernet on these LTE Routers is only really useful for PC / Lappy as Windows will autoload the Drivers, so doable via the that route but as for a adding USB to Ethernet direct or through another Router with RJ45 Ports could be quiet challenging without the Drivers.
