Interested to see the outcome to this.
My inlaws switched over on the 20th, and can make outgoing calls, but not receive any incoming. They are quite elderly, and have just had concerned friends at the door, worried that there was something wrong. Clearly not ideal, and to be honest poses a few safety/well-being issues in my opinion.
I have already advised them to reboot the router, which has made no difference. The Virgin online line checker is reporting "Looks like there's no phone connected".
They were well organised in advance of their switchover date and had an extension run between the router and their phone base unit, as they are located in different rooms. I'll visit tomorrow and try a different handset plugged directly into the router itself.
I popped on here to see if anybody else was experiencing the same issue, and it certainly seems they are not alone.