Cell phone users in Japan are being swamped with junk e-mail despite all-out efforts by telephone companies to combat the nuisance.
Much of the unsolicited e-mail, commonly known as spam, advertises Web sites showing pornography and is sent in bulk to countless cell phone users. Other messages demand payment of bills the recipient never ran up.
The spammers use a number of techniques to deliver their messages, including making up a huge volume of e-mail addresses at random and sending them out in the hope that some will hit a target.