Just to let you know in Derby, past two days mobile internet has been down or very poor indeed. 5 minutes ago was the first time I got any mobile internet, running at about 5Mbps, but currently can't even find a network server in order to test the speed.
I have returned from Rome, where I had no service, tried some fixes that where advised. No I'm home phone was OK yesterday and now I can't make or receive calls or send texts. It says conditional call forwarding enabled when I dial and then the call ends. I can use Internet data though.