Here is an article on mobile phone spam. I guess I should mention that I don’t really believe my recommendation is realistic. To wit:

While respondents said they believe that industry self-regulation is the best way to reduce mobile phone spam, Lindstrom has a simpler answer. "Our best defense is to collectively never reply or respond," he said.

I am not sure whether I said this was "our best defense" since it is completely impractical. If it weren’t, I believe it would be fairly successful.