The flaw involves invisible SMS bursts that allow hackers to gain total control over your phone. When, hijacked, your phone can then hijack all other iPhones in your contacts list. The two dudes who discovered it plan on unveiling it at the Black Hat conference on Thursday. They say they told Apple about it a month ago, but nothing’s been done. How do you prevent your phone from being hijacked? Well, if you get a text containing only a single square character, turn your phone off.”]
Source: https://gizmodo.com/iphone-sms-security-flaw-could-allow-every-iphone-in-th-5325703