How to see my data usage on my iPhone 4S?

This is my 1st iPhone. Can I see my Wi-Fi data and bill 3G data that I pay for separately?

You can call #DATA (#3282) and they'll send you a text with how much data you've used

It depends on your carrier. I have an iphone with verizon and i can sign into their site and see how much i've been using.i'm pretty sure at&t and sprint have this option as well

If you are on at&t download their free app, tells you your exact numbers.

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