Spam has gone mobile

It's hard enough coping with all that spam clogging our computers. Now it's stalking us on our cell phones. Spam has gone mobile. Increasingly, consumers answer their cell phones thinking it's important. Instead, it turns out to be a telemarketer peddling time-share resorts, bogus lotteries or even porn. While computer e-mail spam is just a pain, unsolicited text messages on your cell phone can be costly -- 10 cents or more per message. The problem is so new that federal agencies are still unsure how bad it is or how to combat it. But they say clearly that with millions of new cell phone users and billions of text messages tapped out monthly, the annoyance is growing. Wireless officials say they have learned from the experience of the computer industry and are taking aim at mobile spam. But the problem is that it's a moving target.