SEATTLE -- Text mail spam is especially annoying, since you pay for that message unless you have an unlimited plan. It's also a growing problem. The New York Times reports that cell phone users in the U.S. received an estimated 4.5 billion spam texts last year. That's more than double the 2.2 billion text spam messages received in 2009. And the volume of text spam will only increase as more of us get smart phones. Plus, spammers are now using text messages to snag your personal information. With an email it's called "phishing" but on a cell phone, this scam is called "smishing." The goal is the same only the delivery method is different.