Received an SMS offering tickets to Oprah at 30% discount. Includes another phone number (514-843-2873) to call but also the option to be "removed" from their list (R=Rabais par SMS, stop=remove). Wondering if asking to be removed also comes with a charge or confirms that your cell phone is a real number (i.e. just like unsubscribing from email, often increases the amount of spam)?