Thanks for the reply Gareth. I have rebooted the hub several times since the switch over but did it once again as you suggested.
No change I'm afraid . I still get the recorded message informing me that I need to call 150 to subscribe for the service.
It seems odd that I can make calls to landlines and mobiles on other networks but when I call a Virgin mobile number I can't connect . There was no problem prior to the switch.
I thought initially that my land line phone may not be compatible with the new system but in that case I assume that I wouldn't be able to make any calls.