Hi,
A few years ago, if you were opted out of BT WiFi, you could use 10. on the Hub. Last year I temporarily used the BT Smart Hub 2 where I also tried to use 10. (I'm opted out of BT WiFi), but the hub would not let me use it. I ended up using my own router - I don't like using ISP routers as you are typically limited in what you can configure, especially with the BT Hub. It is designed for plug and play to keep customers away from customer services.