Wait. I thought the only danger to iPhones was if you jailbreak them? Isn't that what Apple has implied? The whole world is only in danger if the iPhone is jailbroken, so we must expend our thoughts and energies on keeping that from happening. Just ignore the man (with the black hat) behind the curtain, who is sending out that SMS.
Not concerned, personally. No iPhone and where I live, the providers charge outrageous fees for text messaging. Besides, I'm old enough to not need texting. Or do they leave it active anyway? Hmmm.