Considering that the last answer here was offensive and not useful in any way what so ever, I deleted it.
Now, most of the time the CD keys for games can be found inside the CD case, on the back of the manual that came when you bought the game :)
If it isn't there, just look in the case and on anything that came with the game. Still not there, you might want to contact the store where you bought the game since it's missing and is needed to play legally online.
A code that allows you to play online in CoD. It should be there right away (if you bought the game legitimately). However, it wasn't for me, so I closed Steam (the game download service) completely and re-opened it as an administrator (right-click, run as administrator) and my key code just magically showed up and the multiplayer started working like a dream.
The serial number for Call of Duty 4 can be found inside the box that the game came in. Each game has a unique serial code.
i have a spare registaration code the numbers are- 019247210245692-
well call of duty and modern warfare are the same it is called Call of Duty: Modern warfare and then came call of duty: modern warfare 2
If you have a Xbox 360 you can install it to your Hard Drive
Call of Duty classic Call of Duty 4 Modern Warfare Call of Duty World at War Call of Duty Modern Warfare 2 call of duty black ops call of duty modern warfare 3
Call of Duty Modern Warfare came before Call of Duty Modern Warfare 2
"Call of Duty 6" "MW2" "Modern Warfare"
"Call of Duty 6" "MW2" "Modern Warfare"
Call of duty modern warfare 3
no theres a call of duty modern of warefare 2
Call of Duty 4: Modern Warfare came out first. This is the first game in the Modern Warfare series, and Modern Warfare 3 is the third game in the Modern Warfare series.
Call of Duty 1 Call of Duty The big red one Call of Duty 2 Call of Duty 3 Call of Duty 4 : Modern Warfare Call of Duty : World at War Call of Duty : Modern Warfare 2 Call of Duty : Blackops Call of Duty : Modern Warfare 3 9 Call of Duties all together, 6 if you take out the modern warfares...
Call of Duty 4: Modern Warfare was just before Call of Duty: World At War, and Modern Warfare 2 came just after it. Unless its on the Wii, on the Wii its WaW the Modern Warfare but its called Modern Warfare Reflex
Call of Duty 4 Modern Warfare