Did u give out your cell phone number to some websites to do some crazy things like IQ TEST, ONLINE GAME on facebook? If so, you've been cheated by them to subscribe some expensive but useless "premium text" service. Usually, you will get some stupid news or slogans from "premium text" provider, e.g. "There are XXXX taxi drivers in NYC". And they charge you $5 or more every week for the service fee.
Call the service company or text them to unsubscribe it ASAP and call FIDO to complain, if you are lucky, you can get some discount of your FIDO service fee for some months.