<i>Never trust any SMS you received on your iPhone at first sight.</i><p>Perhaps I don't understand, but why single out the iPhone? Isn't every phone that receives SMS vulnerable? Couldn't you perform this "attack" with any phone or modem capable of sending SMS?<p>I remember something a while back where you could spoof SMS to send tweets to Twitter as someone else. I assume that's also still possible?
> On iPhone, when you see the message, it seems to come from the reply-to number, and you loose track of the origin.<p>This is a typo right? I could understand the issue if the reply-to is different from the apparent sender (and hidden), but if they are the same what is the issue? As stated by other commenters practically any SMS gateway allows you to set whatever originator (sender) you like.