Viewing my Mobile Date Usage?

So today I got a text saying i've used 80% of my date usage. It re-sets on the 4th, I got the text at 1.30am today and I don't see how I used that much date while I was asleep, and if anything was running, why did it use up all usage? I get 4GB a month.

I have a iPhone 5s, my Mobile Data Usage says 3.3GB, is this my total usage (got the phone last month) or my usage in a day?

Go to settings and look up browsing history and things like that.

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