Grand Theft Auto (GTA IV) Cheat Codes

PC Version.
While playing the game, press Up to display Niko's cell phone. Press Up again to access the keypad. Then, enter one of the following codes to activate the corresponding cheat function. Once a code has been entered correctly, a new "Cheats" menu option will be available on your phone, below "Options", where you can access the cheats without having to enter the phone number again.

Codes :
Health And Weapons
GTA-555-0100

Weapons
GUN-555-0150

Advanced Weapons
GUN-555-0100

Health
DOC-555-0100

Wanted Level Down
COP-555-0100

Wanted Level Up
COP-555-0150

Climate Change
HOT-555-0100

Spawn Cognoscenti
CAR-555-0142

Spawn Sanchez
MBK-555-0150

Spawn FBI Buffalo
CAR-555-0100

Spawn Turismo
CAR-555-0147

Spawn NRG900
MBK-555-0100

Spawn Comet
CAR-555-0175

Spawn SuperGT
CAR-555-0168

Spawn Police Chopper
FLY-555-0100

Spawn Jetmax (Boat)
WET-555-0100