To get back to your original question, I have recently moved from a separate
BT line to a VOIP using a PAP2T and my VM 2Meg cable sevice (no TV, just a
cable modem) Porting my BT number was a big consideration for me, so I
opted for Voipfone who charged £20+vat to port then £2 monthly. They're not
the cheapest voip provider out there, but the service has been A1 for me as
yet. Any VOIP is cheap compared to BT - my advice is tell her to go for it!
Chris.