Apple has issued a security update for the iPhone. The patch fixes a vulnerability demonstrated recently at a hacker conference in Las Vegas, where security researchers showed they could hijack an iPhone simply by sending it a series of booby-trapped text messages. Apple’s patch comes in response to research revealed at last week’s Black Hat security conference, by well-known Apple hacker Charlie Miller and co-presenter Collin Mulliner, a Ph.D. student in telecommunications security at the Technical University of Berlin. The two showed that a specially designed text-message barrage could allow attackers to hijack various iPhone core functions, such as making calls and turning on the device’s microphone and camera. The update is available only through iTunes, which should auto-detect that the update is available. If it doesn’t, or you don’t want to wait around for an auto-update notice (Apple says that process can take up to a week), click the