After many, many attempts to get webmail in the "same old" way, I've now found that the number I've been using all these years doesn't work any more. There's a modem there, but it hangs up. I tried using the old number (I used to use it years ago, until I found out how expensive it was!)
For the record, the number I can't use any more is 0771 2932932.
The old number which I've now found works is 0844 0529009.
It remains to be seen how much it costs........
Please note, especially moderators, neither of these numbers is a personal number; they are both dial-up numbers for mobile webmail!