Well I guess this confirms a feature that has been in the series since MW2. But if you interact with the Call of Duty Messenger BOT you may recieve a code for a unique calling card when the game launches on November 4[SUP]th[/SUP]

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The BOT was released a few days ago and allowed people to find little things out about COD :IW before the release, and also if the BOT was give a correct decoded cipher, it revealed the time of the trailer which dropped today.

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I tricked the BOT into saying it will give me a free game...

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