Yes, I understand your point.
What I am saying is please can you provide an example of where this has happened.
I don't believe it has, and you are purely scaremongering.
I can't find a single news article about your scam so perceive that it does not exist.
I am also fairly confident that the service providers (ie BT etc) will automatically have this kind of number barred from your phone - so you can't ring it even if you tried.
After all, if you were to get this kind of bill, most people would fight it.
So again, please can you provide a link to a story where this has happeded to a British person.