How to check how much data I have used on my iPhone 4s?

I'm on the 4 GB plan with my family and I wanna make sure I don't go over. How do I check on how much date I have used on my iPhone?

Ikr! Check The Website! You'll Need Your Mom's Login And Stuff But Yeah! Or You Can Search The App Store

1. Go to Settings.
2. Select General.
3. Select Usage.
4. Select Cellular Usage.

Under Cellular Network Data you can see Received and Sent Data. If you are on 4GB data plan per month then you can view these statistics every month then reset the statistics every month so you can view your data usage every month or so.