Grand Theft Auto 4 Cheats

Full health and armor
Dial "3625550100" on the cell phone. If you enter this code while in a vehicle, it will also repair it.Note: This phone number translates to "DOC-555-0100". This code prevents the "Cleaned The Mean Streets", "Finish Him", "One Man Army", and "Walk Free" achievements from being earned.
Full health, armor, and ammunition
Dial "4825550100" on the cell phone. If you enter this code while in a vehicle, it will also repair it.Note: This phone number translates to "GTA-555-0100". This code prevents the "Cleaned The Mean Streets" achievement from being earned.
Weapons tier 1
Dial "4865550100" on the cell phone. This will unlock the baseball bat, handgun, shotgun, MP5, M4, sniper rifle, RPG, and grenades. Note: This phone number translates to "GUN-555-0150". This code prevents the "Cleaned The Mean Streets" achievement from being earned.
Weapons tier 2
Dial "4865550150" on the cell phone. This will unlock the knife, Molotov cocktails, handgun, shotgun, Uzi, AK47, sniper rifle, and RPG. Note: This phone number translates to "GUN-555-0100". This code prevents the "Cleaned The Mean Streets" achievement from being earned.
Remove Niko's wanted level
Dial "2675550100" on the cell phone. Note: This phone number translates to "COP-555-0100". This code prevents the "One Man Army" and "Walk Free" achievements from being earned.
Add one star to Niko's wanted level
Dial "2675550150" on the cell phone. Note: This phone number translates to "COP-555-0150".
Spawn Annihilator police helicopter
Dial "3595550100" on the cell phone. The Annihilator is armed with rockets. Note: This phone number translates to "FLY-555-0100". This code prevents the "One Man Army" and "Walk Free" achievements from being earned.
Spawn Cognoscenti
Dial "2275550142" on the cell phone. Note: This phone number translates to "CAR-555-0142".
Spawn Comet
Dial "2275550175" on the cell phone. Note: This phone number translates to "CAR-555-0175".
Spawn FBI Buffalo
Dial "2275550100" on the cell phone. Note: This phone number translates to "CAR-555-0100".
Spawn Jetmax
Dial "9385550100" on the cell phone. Note: This phone number translates to "WET-555-0100".
Spawn NRG-900
Dial "6255550100" on the cell phone. Note: This phone number translates to "MBK-555-0100".
Spawn Sanchez
Dial "6255550150" on the cell phone. Note: This phone number translates to "MBK-555-0150".
Spawn SuperGT
Dial "2275550168" on the cell phone. Note: This phone number translates to "CAR-555-0168".
Spawn Turismo
Dial "2275550147" on the cell phone. Note: This phone number translates to "CAR-555-0147".
Change weather and brightness
Dial "4685550100" on the cell phone. Note: This phone number translates to "HOT-555-0100".