Is there some way I can check a friends VISA status?
UKBA will certainly not confirm to a third person anything about someone else’s immigration status. It’s like calling the Police and expecting them to tell you about someone’s criminal record just because you’re curious. It is true that Immigration routinely ignore a lot of the calls they get, this is because the “information” is usually so vague as to be meaningless, however they certainly follow up if there are specific and credible facts. Someone who is reported as being illegal may in fact already be known to immigration, they may have an application pending, or granted, or there may be significant obstacles in the way of immediate removal.