see http://www.mahalo.com/Grand_Theft_Auto_4_Walkthrough

Armor
362-555-0100

Weapons #1
(Baseball Bat, Handgun, Shotgun, MP5, M4, Sniper Rifle, RPG, Grenades.)
486-555-0100

Weapons #2
(Knife, Molotovs, Handgun, Shotgun, Uzi, AK47, Sniper Rifle, RPG)
486-555-0150

Remove Wanted Level
(Blocks achievement “Walked free”)
267-555-0100

Raise Wanted Level
267-555-0150

Change Weather/Brightness
468-555-0100

Spawn Annihilator
359-555-0100

Spawn Jetmax
938-555-0100

Spawn NRG-900
625-555-0100

Spawn Sanchez
625-555-0150

Spawn FIB Buffalo
227-555-0100

Spawn Comet
227-555-0175

Spawn Turismo
227-555-0147

Spawn Cognoscenti
227-555-0142

Spawn SuperGT
227-555-0168

Complete Map – (with weapon, health, armor, pigeon, etc. locations)
Enter the URL “www.whattheydonotwantyoutoknow.com” into computers in the game

Dial GTA-555-0100 (482-555-0100) to restore Niko to full health and a complete complement of ammo.

Dial GUN-555-0150 (486-555-0100) to unlock some seriously heavy new weapons, including an RPG, grenades, a sniper rifle and a surprisingly handy baseball bat.

Dial COP-555-0100 (267-555-0100) to remove Niko’s wanted level if you’ve got too many of Liberty City’s finest on your tail.

Dial COP-555-0150 (267-555-0150) to add a star to Niko’s wanted level if it’s all proving just a bit too easy for your criminal mastermind.

Dial FLY-555-0100 (359-555-0100) to spawn a police helicopter.

Dial HOT-555-0100 (468-555-0100) to change the weather in Liberty City.

You can also call up a map that reveals the location of all weapons, health bonuses, armour, vehicles, stunt ramps, entertainment joints and pigeons. Simply wander into any of the in-game TW@ internet cafes, log onto a computer, and type in: http://www.whattheydonotwantyoutoknow.com.

And if you object to the idea of bolstering Liberty City’s coffers every time you cross a toll road, there’s any easy way to avoid the $5 charge – simply steal an emergency vehicle, hit the lights and siren, and obliging booth attendants will let you through the toll for free.

Enter into Niko’s cell phone.

Weapons Tier 1: Press R1, L2, R2, L1, Up, Down, Left, Right, Up

Weapons Tier 2: Press R1, L2, R2, L1, Right, Down, Left, Up, Right, Down, Left, Up

Weapons Tier 3: Press R1, L2, R2, L1, Right, Down, Left, Up, Right, Down, Left, Up, Right(2)

Run Quickly: Press R1(2), Left, Right, L2, Square, Triangle, L1, Circle

Invincibility: Press R1, Circle(2), L2, R2, Triangle, X, L1, Right

Health: Press R1, L1, L2, Square, R2, Left, Right, Left, Right

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