My drop down menu on iPhone 4S has disappeared! How do I get it back?

The grey menu at the top of my screen that you can slide down and see weather, new notification and messages has disappeared! I want it back cuz it's bugging me I can't scroll down to see if I have a message anymore so is their a way to get it back? Sometimes I accidentally hit stuff and like delete an app or change a setting but i don't know how to fix this one!

Have you attempted to scroll down without seeing the grey box there? I'm looking at my iPhone's settings and I don't see what it could be under.
If you've updated it recently, Apple may have removed that feature.