How do I stop Spam text messages?

I was getting spam texts for a while on my cell phone.

"Need Extra Cash?
Get $1,500 cash advance wired to you within 1 hour!
go to: www.cashXXXDon't go theplaceusa.com
promo code:PJ16Z

to end reply STOP"

I didn't want to reply b/c in emails we aren't supposed to reply to them or click on them at all. But after talking to my t-mobile rep, he said that cell phones are much safer in that regard. Also, Bush's anti-spam law requires that If you text back to them STOP, they have to stop. If they continue, call your cell phone company for a number to complain.

I was initially complaining to the FCC, but the process took too long.