sorry, no cheat for that, maybe a mod for the PC though...
there is none.
yes, gta4.net has all the cheats, not many cheats are in the game though.
the jet pack cheat for GTA IV on xbox 360 is. 7843-555-0127.
there is none. try the health cheat though, it should help you for everything that doesn't kill you instantly.
for xbox 360 ofcorce. xbox 360 is better than ps3
no xbox 360 games do not work on original xboxs
Yes.
no
The Xbox 360 does not have cheat codes, so you can't.
you can't, there is a overpowered health cheat though.
You can get a a Xbox 360 Xploder cheat disk.
No, PS3 players cannot play with Xbox 360 players online.