@LibbyD8 Having mobile broadband can be very hit or miss, when i was with EE on mobile, there service checker said, mobile broadband great outdoors, great indoors/outdoors, it was a complete load off tosh, the signal from the mast was just so poor, so bad that when inside the home 90% off the time hardly any mobile phone signal, if you are similar then try moving the position of the hub about to at least maximise the signal quality, if it is just slow down because off the time when mobile get's busy not much you will be able to do about that.
Find a nice neighbour and see what and if any connection for fixed broadband they have into the home.... You may not have any OR openreach availability as the address checker is throwing up as you posted... O2 is the strongest mobile for me, so returned back to them when i quit EE, it's all trial and error on the mobile side off things for sure, and do take all of the mobile checkers with a pinch off salt.
Do also check, you may have VM Virgin Media as a connection also in your area....
