FBI Director James Comey said the FBI’s new method for unlocking iPhones does not work on most iPhone models. Comey: “It’s a bit of a technological corner case, because the world has moved on to [iPhone] 6’s,” Comey said, describing the flaw in response to a question. FBI agreed to help the Police in Arkansas in the homicide case by unlocking an iPhone and iPod belonging to two teens accused of killing a couple. Now WhatsApp supports end-to-end encryption by default for its over 1 Billion global users, which is why the FBI is worried criminals and terrorists will take advantage of this move to hide their crime- or terrorism-related communications.
Source: https://thehackernews.com/2016/04/unlock-iphone-hacking-tool.html