To randomly change the weather and time of day, break out your cell phone and insert the following number: (468)-555-0100.

To get rid of Niko"s wanted level, insert the following number into your cell phone: (267)-555-0100. To add stars to Niko"s wanted level, insert this number instead: (267)-555-0150. Keep in mind that this will disable your ability to acquire some achievements.

Head to the internet café (or wherever you can access the internet) and insert the URL www.whattheydonotwantyoutoknow.com. If inserted properly, you"ll be brought to an in-game message board containing maps of secret locations in the game. Check it out!

To refill Niko"s health and to give him some fresh armor, insert the following number into your cell phone: (362)-555-0100. If you want to give him health, fresh armor andrefill all ammunition, insert this number instead: (482)-555-0100. Keep in mind that this will disable your ability to acquire some achievements.

Any time you"re outside, break out your cell phone and insert the following phone numbers to unlock the vehicles listed.

• Annihilator (Helicopter) - (359)-555-0100
• Cognoscenti (Car) - (227)-555-0142
• Comet (Car) - (227)-555-0175
• FIB Buffalo (Car) - (227)-555-0100
• Jetmax (Boat) - (938)-555-0100
• NRG-900 (Motorcycle) - (625)-555-0100
• Sanchez (Car) - (625)-555-0150
• Super GT (Car) - (227)-555-0168
• Turismo (Car) - (227)-555-0147

To unlock a baseball bat, grenades, M4, MP5, pistol, RPG and sniper rifle, insert the following number into your cell phone: (486)-555-0100. Keep in mind that this will disable your ability to acquire some achievements.

To unlock an AK-47, knife, Molotov Cocktails, pistol, RPG, sniper rifle and Uzi, insert the following number into your cell phone: (486)-555-0150. Keep in mind that this will disable your ability to acquire some achievements.

Head over to the Statue of Happiness and climb up as far as you can go. Head around the left side of the statue from where you entered. When you do this, the game will pause briefly and load a new shirt that your character will be wearing, a nice souvenir for visiting the statue!

At one point in the game, you"re given an option to kill Dwayne or Playboy X, and you must choose one or the other. If you kill Playboy X, you can use his loft and change clothes there. Amongst your change of clothes will be the outfit from GTA3 -- a tight black jacket and green cargo pants.