You could, in case they blocked access with wifi, use an usb to etherent adapert which you should be able to connect to most mobile phones with an usb otg cable. Often you need to give yourself (in this case the mobile phone) an static ip, many routers have their config ip printerd on the underside or in the manual, if it is e.g.: 192.168.2.1 then if you don’t get an network address automatically with DHCP you need to give yourself another ip in the same network, so 192.168.2.X wher X not equals 0,1 or 255.
So to conclude blocked wifi config will likely be your greatest difficulty, everything else should be perfectly fine with a mobile device.
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