It's probably your Xbox LIVE settings. In the settings, you can change a rule to hear people online or choose not to. Or maybe your TV volume is down.
Umm....... You can.
you cant.
you have to buy them. you cant 'unlock'
Simple you cant only in world at war
you cant on the wii version
you cant
you cant, that's in Call of duty 5, World at war for getting a 7 kill streak; and the new Call of Duty 7, Black ops for getting an 11 kill streak
On the pc:cheats On the xbox 360:hacks On the ps3:cant
You cant.
You cant
mine works i have it i played the coop its sik :D
destroy it and get a new one