Hackers ring up big phone bills for hospitals.

A big telephone bill--possibly in six figures--can be a painful way for a hospital to find out its phone system isn't secure. When unusually large long-distance bills start to show up, chances are a professional telephone hacker has broken in. According to experts, one in 15 businesses has been victimized by long-distance toll fraud, and loss estimates range from $900 million to $4 billion a year.