How exactly would that happen?
Well in my case somebody would have to check up my number to find the network and then get a job working for Tesco Mobile, or at least find and become good friends with somebody who did. They would need to have access to customers personal details, and could then presumably find out my legal name, address, bank details and whatever by searching the records for my number.
But what would they then do with this information? Every possible course of action they could take is going to get them (or their friend) fired, prosecuted and probably both? Going to lengths like this just to wind up being charged with harassment (which would include contacting me and telling me that they have this information more than once) and more than likely winding up in the local paper doesn't seem like a very sensible use of anybody's time to me.
So maybe its a myth then eh?
See above

.