If you are an iPhone user, or even if you know an iPhone user, you should be aware of a security hole where your iPhone can be hacked via SMS. This is serious stuff and you should share this knowledge with everyone you know. This hole could enable the hackers to take total control over your phone. Here are the details according to wired.com’s Gadget Lab:

Security researchers Charlie Miller and Collin Mulliner will publicize the exploit Thursday at the Black Hat cybersecurity conference, according to Forbes. The researchers said the hack involves sending a series of mostly invisible SMS bursts that effectively hijack an iPhone. From thereon, a hacker could control all the functions on the iPhone, such as e-mailing, dialing contacts — and, most alarmingly, sending more text messages to hijack even more iPhones.

How can you know if you’re being SMS attacked? According to Miller, one giveaway is if you receive a text message containing a single square character. If that happens, he suggests you immediately turn off your iPhone.

“This is serious,” Miller told Forbes. “The only thing you can do to prevent it is turn off your phone. Someone could pretty quickly take over every iPhone in the world with this.”

So until you hear otherwise from Apple, do as it says and turn off your phone immediately if you get a strange square text message. I would suggest taking your phone into the Apple store before turning it back on. Hopefully Apple will release a new iPhone OS patch soon to take care of this issue.