In Call of Duty: Modern Warfare 3 (MW3), you cannot access the vault feature without an online connection. The vault is designed to store and manage various game items, which requires online functionality to sync your data. Therefore, you need to be connected to the internet to utilize the vault and its features.
You have to go onto multiplayer then go to vault.
Go into your "Vault" to do this.
Idk but look at the online vault on mw3 some people have mods for private matche for example desert eagle akimbo with suprressor, barret 50. Cal with rapid fire and more just download the custom game mode from the online vault
you absolutly can't
i don't know why yours doesn't go online because when i play mw3 it works online and everything. maybe its your system or the game so you should have it checked out
First go to multiplayer. Then go down to vault and it will have all your played matches for you to watch. Hope this helped!
no
go to settings on xbox and then profile and switch the thing from online to offline.
Cod MW3 has 80 levels online
Play more and read the wiki on MW3
No.
Not on the PlayStation Network