Generally, you should only conduct transactions involving personal information if you are the person who initiated the call. You should also be wary of callers who say information is needed in order for you to collect a prize. There's a booming "information industry" in America, and companies sometimes employ a method known as "pretexting," in which they contact you or your family to gain personal information through deception. In most cases this is legal, although the information can then be passed on to someone who uses it to commit a crime, such as identity theft or stalking.