How much does it cost to break a 2year iPhone AT&T contract?

I have an iPhone 3GS. I'm wanting to get the iPhone 5 when it comes out in October, but my iPhone contract doesn't end until August, 2013. How much will it cost to break my iPhone 3GS contract, then buy a new iPhone 5 (estimate for much the total would be for both the iPhone 5 and extra money for breaking contract)?

Doesn't anyone read anymore? $350 minus $10 for every month completed. The Iphone 5 doesn't have an announced price but figure 200-400

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