Grand Theft Auto 4 is the biggest party and release of gaming world this years, the sales forecast around $400 million JUST FOR THE FIRST WEEK! wACKO! Well the game its self already make an addict for anyone who love to ruin the city with their car and doing what they like with the street! Liberty on whatever.

How the cheat codes works ?

While playing the game, press Up to display Niko’s cellphone. 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. Note: Do not save the game after enabling a code to avoid unforeseen problems. Enabling some cheats may prevent achievements from being earned.

• Full health - Dial “3625550100″ into the cellphone. 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 and ammunition -  Dial “4825550100″ into the cellphone. 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″ into the cellphone. 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″ into the cellphone. 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″ into the cellphone. 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″ into the cellphone. Note: This phone number translates to “COP-555-0150″.
• Spawn Annihilator police helicopter - Dial “3595550100″ into the cellphone. 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″ into the cellphone. Note: This phone number translates to “CAR-555-0142″.
• Spawn Comet - Dial “2275550175″ into the cellphone. Note: This phone number translates to “CAR-555-0175″.
• Spawn FBI Buffalo - Dial “2275550100″ into the cellphone. Note: This phone number translates to “CAR-555-0100″.
• Spawn Jetmax -Dial “9385550100″ into the cellphone. Note: This phone number translates to “WET-555-0100″.
• Spawn NRG-900 - Dial “6255550100″ into the cellphone. Note: This phone number translates to “MBK-555-0100″.
• Spawn Sanchez  -Dial “6255550150″ into the cellphone. Note: This phone number translates to “MBK-555-0150″.
• Spawn SuperGT - Dial “2275550168″ into the cellphone. Note: This phone number translates to “CAR-555-0168″.
• Spawn Turismo - Dial “2275550147″ into the cellphone. Note: This phone number translates to “CAR-555-0147″.
• Change weather and brightness - Dial “4685550100″ into the cellphone. Note: This phone number translates to “HOT-555-0100″.

For the full list of the cheat codes, please visit the cheat code central. Here