My iPhone 4 doesn't have the carrier in the top left hand corner?

My iPhone is carried by Verizon, in the top left hand corner, the name of my carrier isn't there. My phone is activated and all that stuff, but its just not there. Its up to date on everything, i can make and receive calls, its just bothering me. Any way to fix it? Thanks in advance.

Added (1). I know it works and nothing is wrong with it, its just bothering me.

Take the sim out by using a needle and poping the sim out and turn it off then shut back off and. Put the sim back in

It works. I don't understand what your problem is. I also don't understand why you're asking us instaed of Verizon.