Verizon, for its part, has managed to track down and sue some 20 spammers over the years.
Cloudmark, the message-security company, says domestic wireless providers may not have always made mobile spam their top priority, but they are making a genuine effort to respond now that unwanted messages are spiking stateside.
The spammers aren’t just sitting on a couch somewhere typing messages one by one into a handset.
And thanks to a fiendish device called a SIM box, the spammers can plug dozens, even hundreds, of SIM cards—each representing a different mobile phone number—into a single phone.
By the time you’ve received a text and reported the number, there's a good chance it has been used hundreds of times and discarded.
But unlimited texting plans made that approach less attractive to spammers, who know that such messages can easily be blocked.
Though it’s still worth doing, don’t expect a magic bullet.