877-707-1755

I received a text from 72449 that says ">>9284 is your pin. Enter it on Mind Quiz to Reveal Your IQ! Txt HELP 4 Help or 18777071755 9.99/mth othr chgs may aply txt." WHAT is it? Will I be charged 9.99 a month and for what?

This person or company had a pop up window that would not let me get out of the pop up unless I gave a cell #, when trying to log on to craigslist.....now they keep sending me unwanted trivia text to my cell#..... I'm sure there's a charge and I want stopped now......  and of course the # they listed to cancel doesn't work..... 1-877-707-1755 the number on the last text is #62131.....There has been 4 text since Sunday 2/20/2011...... maricturman@yahoo.com is the email I was on when this happened, but I was on my roommates lap top.
How do I get this to stop?  I have no ideal where to begin......

Hey, I just found out if you reply to the unwanted text message from "Mind Quiz to reveal your I.Q.",  the word: STOP.....it will unsubcribe you...........