Ever get a text message that appears to be spam, but you don’t really know what to do with it? It turns out, most carriers will let you report it by forwarding it to 7726 (SPAM).
The full story: Forward Spam Text Messages to 7726 to Report Them | LifeHacker.
The article reviews the carriers in the U.S. I researched carriers in Canada and some of them have the same 7726 spam reporting service.
Rogers discontinued 7726 spam management service September 1, 2015. Rogers Spam Controls information page. (Link no longer valid as of June 1, 2016: Received Text Messages – Protection for Text Messaging SPAM | Rogers Wireless)