The serial that is used to play Call of Duty is the one 'inside game'. I mean, you don't need to activate the game or redeem it anywhere. You just need to put the serial in the options menu and play. This game has been out for while now, many servers don't even ask for serials anymore, you can just use some random keygen and play. I have the original game, but lazy as I am, I used a keygened (does this word even existis??:P) one to play. The game checks the serial when you joing a server, sometimes you got the 'serial code in use'. These are the servers that asks for serial:P Ps.: COD4 is an AWESOME game.

1. Cod4 Key Code

One of the best cods I've ever played. It's the begining of the downfall, the edge ehehheeh.

Cod4 Key Code

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