Spam SMS are very big headache for everyone if he/she using any mobile device and a lot scams message saying different offers such as free stuff and prizes. According to Cloudmark iPhone users has been target with new iMessage spam recently, and here is how to stop iPhone iMessage spam.
As Cloudmark outline some information regarding this new iMessage spam on their blog as follows:
During the past two months, 34 percent of all reported SMS spam in the entire U.S. was from this single campaign advertising various discount sale sites peddling, likely knock-off, designer goods. Brands included Louis Vuitton, Hermes, Gucci, Prada, Celine, Oakley and Ray Ban Sunglasses, Michael Kors, and Tiffany & Co Jewelry. Oakley and Ray Ban sunglasses were by far the most common among them, probably because it is summertime.
New York City was the fourth most impacted area in the country trailing behind only Los Angeles, San Diego, and Miami. Of all SMS spam reported in NYC during the past two months, 47 percent has been from this single campaign that currently only affects iPhone users.
(source: Cloudmark)
See Also:
How To Stop iPhone iMessage Spam
Just keep in mind, if you have something like that then just report this to Apple by keep forwarding the very same text message to 7726.
On the other hand you can even block the sender by adding the same number in block list with simply by navigating Contact > tapping i > and then hit Block this Caller directly from messaging thread with in Messages app.