A new Apples iOS bug was discovered in the community of mobile tech experts, it can be exploited to crash iPhone or iPad devices by just sending an Emoji text message. A simple sequence of three character-long text message containing Emoji can cause the block and the reboot os iPhones and iPads running iOS 10.1 or below. The issue is linked to the way that iOS creates the rainbow flag emoji that is not an official emoji. Users have to upgrade their version to the last one in order to prevent such kind of attacks.”]
Source: https://securityaffairs.co/wordpress/55462/hacking/emoji-text-message.html