How do I block numbers that starts with Starts With,Has?

[Windows Central Question]

How to block numbers with "starts with", "Has" feature in Windows Phone

I have purchased an Windows Phone Lumia. I have seen that there is a feature "Call + SMS filter" there you can block calls /SMS. But until and unless someone is going to call you you canot block them.

Can I block calls in the basis of "Starts With", I know directly this feature is not there in current App.

I have doubt about the "Block withheld numbers". What is this?

Can I achieve what I have asked here? Please help.

Thanks
Deb