How to cheat at Grand Theft Auto IV

Cheat codes for GTA IV and a bit of gameplay footage to demonstrate them.

Spawn Cognoscenti (Mafia Car): "Call CAR-555-0142"
Spawn Sanchez (Dirt Bike): "Call MBK-555-0150"
Spawn FBI Buffalo: Call "CAR-555-0100"
Spawn Turismo: Call "CAR-555-0147"
Spawn NRG900: Call "MBK-555-0100"
Spawn Comet: Call "CAR-555-0175"
Spawn SuperGT: Call "CAR-555-0168"
Spawn Police Chopper: Call "FLY-555-0100"
Spawn Jetmax(Boat): Call "WET-555-0100"

Health And Weapons: Call "GTA-555-0100"
Weapons: Call "GUN-555-0150"
Advanced Weapons: Call "GUN-555-0100"
Health: Call "DOC-555-0100"
Wanted Level Down: Call "COP-555-0100"
Wanted Level Up: Call "COP-555-0150"
Climate Change: Call "HOT-555-0100"

As you can see in the video, certain cheats disable certain achievements.