Why is my Verizon Bill so high?

I just received my first bill from Verizon Wireless on my new smart phone, the Droid Incredible. The bill was over $600 and most of my bill was of Megabyte Usage and Data, can someone explain what this is and what I did? And what I should do to get my bill to be lower the next time? I appreciate all answers, thanks.

Info:
I do surf the internet sometimes, download and use apps, have unlimited texting.
 
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