If you receive a text message in the near future containing nothing but a square character, Collin Mulliner and Charlie Miller suggest immediately turning off your iPhone, as this is the only clue you will get that someone has exploited the bug that could take over your iPhone completely. At today's Black Hat cybersecurity conference, they plan to publicize this bug, which, when exploited properly, can be used to gain control of all functions of someone's iPhone without their consent or even knowledge.
