hmmm . . . a year or so ago I was kindly informed by VM that I was required to go VoIP for my phone. I wasn't keen so rang to enquire - long story short, yes if you still want the phone option you have to go VoIP . . and, after a further question from me - you will still be charged for the phone 'line' because we are still supplying the phone connection over VoIP.
They fully deserve every loyal customer that walks away at the end of contract