That is impossible
Any version of MW3 is compatible with the COD Elite program. It doesn't matter if you use Xbox 360, PS3, or PC.
Some time in may
yes it is
PS3 does have free internet but Xbox does have the more on MW3
Yes MW3 has a PS3 version of the game
No. DLC for any Call of Duty you had to pay money for, and MW3 will continue that way.
Why would an Xbox code work on a PS3
Buy the game with it included
17th July for Call of Duty Elite for Xbox. 18th July for normal Xbox, PS3 and PC have yet to be announced.
Sorry Bro There Is No Knife In mw3.
No there is not
Play more and read the wiki on MW3