Emergency call option seems to have disappeared from my lock screen

Hi all, just discovered that I can no longer find the 'Emergency Call' button on my iPhone's lock screen in iOS 7... I've never actually used it before, but when I just read about a security flaw in that feature I wanted to test it out and found that button to be absent, I can't find it anymore when dragging my finger across the screen or flicking. Is it just me, or is anyone else having the same issue? Robin