A security vulnerability has been fixed by Apple to close the a Security Flaw on your iPhone.
Security experts explained Thursday at the Black Hat security conference that a series of hundreds of invisible SMS (short message service) text messages could be used to embed code into the system's memory and run a malicious executable file.
Users would only notice a single message with a small square in it.
Read more: http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2009/08/01/BUME192BCE.DTL#ixzz0MvYKhrVX
To run the update on your iPhone, open iTunes, click on Help and Run Updates…