I have also recently switched to Virgin Media and am having similar issues - calls seem to be working fine but I’m n it receiving any texts whatsoever. I ported my odd number across from Three on 02/09 and the issue has been ongoing since then.
Welcome to our Community and thanks so much for your first post - so sorry that you're having some issues with your services since your number was ported. We have located your account from your forum information and have raised this to be investigated by our porting team for you.
We usually get a response within around 3-5 working days and we'll be sure to update you as soon as we can. Of course, please feel free to pop back if anything changes at your end before we have contacted you.