Our BB failed on 2 Feb which killed the telephone too. Fortunately we have the BT Hybrid Hub in addition to the BT Home Hub 2 so we were able to communicate. I asked the BT Openreach engineer today how people could/should report a fault if both BB and phone were off the air and they only had a mobile ?
He gave me this number and readers might like to make a note of it . . .
08006781107 - which is apparently 'BT Wholesale' - no, I don't know either.
You can't call BT Wholesale nor Openreach unless you're a broadband provider.
You call whoever you pay for your service.