Meetkumar Hiteshbhai Desai, 18, discovered an iOS vulnerability that could be exploited to manipulate devices, including trigger pop-ups, open email, and abuse phone features. Desai shared the critical iOS exploit on Twitter with over 12,000 followers, out of which over 1,849 clicked on that link. People accessing the exploit link from their iPhones and iPads were forced to call 911 non-stop, which flooded a 911 call center with more than 100 hang-up calls within a “matter of minutes”
Source: https://thehackernews.com/2016/10/hacking-911-service.html