Thank you for your post, sorry to hear you've been having issues with the Connect App since moving home.
When you move your services to a new address, a new account will be created for you and so you'll either need to create a new My Virgin Media account or have both your old and new accounts merged so you can continue using your existing log in details to sign into your new account. You'll use the same credentials to access the Connect App, so it's possible that you're still using your old details.
Can you please confirm if you've created a new My Virgin Media account or had the accounts? If not, that's most likely the cause of the issue and something we can sort for you from here.
Nothing to do with account I have signed in fine on my iPad with my old credentials and the connect app is working fine all my details are the same in my account apart from account number but I sign in just the same as before.
The app just won’t work on my iPhone 12 Pro says im not connected when I clearly am and doesn’t even give me the option to sign in.
You will likely be able to log in with your old credentials, but they will be assigned to your old address and your services there. If you're at a new address, you'll have a new account with new credentials for your new property and the services there.
As my colleague has advised, please use the credentials for the account at your new home and then try the app. If the issues persist once you've done that, let us know.