How do you find Xbox 360 cheats for "Grand Theft Auto 4"?

Fan website GTA4.net provides a list of in-game cheats for Grand Theft Auto IV. These cheat codes can be dialed into the in-game cellphone and provide the player with a wide variety of benefits.

The cheat codes in Grand Theft Auto IV are styled as phone numbers. Players can enter these codes without pausing the game. To use a cheat code, players first bring up the cell phone's number pad and manually enter the numbers for a specific code. Examples of cheats include giving a character upgraded health and armor, raising his wanted level, changing the weather or spawning the best cars in the game.