Unfortunately you can't opt out of the change as all providers are moving to a phone-via-hub connection as part of a national programme.
If your phone and hub are not near and/or you make use of extension sockets, then VM should offer to link your hub to your extension sockets free of charge as part of the switchover. See
https://www.virginmedia.com/help/home-phone/virginphone/switchover
and the section beginning
You’ll need to book a free technician visit if:
You’ve got connected devices such as a burglar alarm linked to a control centre, use a telecare device, or have other phones connected to extension sockets. You’ll need to contact your provider and let them know about the switch if you have any of these to make sure they’re compatible with a fibre service
Your Hub and phone can’t be placed near each other
You also should not pay any more for the service although some have reported seeing a 'package change' charge on their bill but from the same link above it shows
Just so you know...
We’re switching your home phone service over to our fibre network from the traditional telephone line at no extra cost.
