Lock vulnerability

When iphone is locked, ask siri to "change your name". siri will throw a dialog box with all the details of the iPhone owner, click anywhere on the screen it will directly take you to the contact details of the iPhone owner without even asking to unlock the iPhone. now the iPhone is unlocked. through it only happens once i.e first time. if you will try to repeat it will ask to you enter passcode. Do check this. Tested on:- iPhone - 6 and 6 plus iOS - 8.4