All of the newer Call of Duty games can be played online. I've been playing since Call of Duty 4, and they are making Call of Duty 8 right now, and all have been online enabled.
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you cant a ps2 does not play online games
yes, call of duty world at war has online. you go into multiplayer and click play online.
Only one person per X-box can play Call of Duty 4 online.
if you want to play online you will have to
You can only play online for free with a PS3 or xbox360 or a wii. So make an account go to your call of duty game and go to multiplayer go to online connect and there you go your on online mode