A bug in Apple’s iOS means that anyone can crash an iPhone by simply sending it a certain string of characters in a message.
When the text message is displayed by a banner alert or notification on the lockscreen, the system attempts to abbreviate the text with an ellipsis. If the ellipsis is placed in the middle of a set of non-Latin script characters, including Arabic, Marathi and Chinese, it causes the system to crash and the phone to reboot.
Users have speculated that it is due to how the banner notifications process the Unicode text. The banner briefly attempts to present the incoming text and then "gives up" thus the crash. On a jailbroken device, this ultimately leads to safe mode. However, on a stock iOS device, there is no safe mode hence the respring after the crash.
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