Welcome to the Community Forum and thanks for your post. I'm sorry to hear that you are experiencing a problem with your SIM card. Is this working for you now?
You can't transfer your credits over from one SIM to another, but if you've tried this SIM card in two different handsets and it's still not working, the SIM looks to be faulty.
I can arrange a replacement for you, but I'll need to take more information from you first. I'll send you a private message requesting further details. Just check the envelope icon at the top right of this page.
Virgin Media Forum Team
Need help changing SIM card? Find out more about activating your 4G ready SIM. 4G SIM Swap Help