How to make the status bar on my iPhone 4S grey?

On everybody else's screenshots & such, most people's status bar is grey, the Wi-Fi thing will be blue & the battery green. How do I do this? Please don't give me an app to download, I'm pretty sure you don't have to.

Check everything about iphone 4S here below

  • Why is my Wi-Fi bar grey or dim on my iPhone 4S? I just got an iPhone 4S from a girl and after I set it all up (it's not on a plan) and the Wi-Fi bar is grey/dim and I can't connect to Wi-Fi anywhere and I can't slide it.
  • Why is my iPhone 4S not displaying the status bar when I'm on Safari? I was on YouTube and then I look up and the status bar on my iPhone wasn't there! It's there on any other app but on Safari it totally disappears. What is wrong with my iPhone? No my phone is new. I got it for my birthday about 6 months ago. It was in its box and my parents got it at best buy. So it's not jail broken.
  • Why doesn't my Facebook status say via iPhone? I have an iPhone 5. I have the Facebook app installed and I use it. I have already put in my details in the Settings. My status always says "via Mobile". How do I get it to say " via iPhone" or "via iPhone 5"? It doesn't matter which one.
  • What is this iphone 4 status bar icon? This icon is a red horn with marks coming out of it simulating sound I suppose. I flip the silent/loud switch on and off and it doesn't make a difference. And a bonus, this icon is a phone, just a phone like one on a flip phone answer button. Please assist!