As you probably know, you can send special SMS to the iPhone and after that this iPhone will be "dead". Not actually dead, recipient's UI system will crash, he will see a black screen for a while. After that, message app will be not working anymore. This is working not only with an SMS, but with other applications that can send push notifications. There is a defect in some UI elements in iOS which cause this crash if they want to display one latin, two Arabic, two Marathi and one Chinese symbol...