glad i got a spackberry now...
http://www.forbes.com/2009/07/28/hackers-iphone-apple-technology-security-hackers.html
If you receive a text message on your iPhone any time after Thursday afternoon containing only a single square character, Charlie Miller would suggest you turn the device off. Quickly.
That small cipher will likely be your only warning that someone has taken advantage of a bug that Miller and his fellow cybersecurity researcher Collin Mulliner plan to publicize Thursday at the Black Hat cybersecurity conference in Las Vegas.
http://www.forbes.com/2009/07/28/hackers-iphone-apple-technology-security-hackers.html