This will happen in the “Cleaned the Mean Streets” mission.
To enable cheats in the game, you have to wait for Roman to give you his old mobile phone.
Grand Theft Auto 4 Cheat Codes for PS3 Cheat Code This pretty much gives you godlike ability which sucks the fun out of it. One of the most overpowered cheats is the instant regeneration of health, armor, and ammunition. If you want to use cheats in GTA 4, and at the same time still enjoy the story progression, then we highly recommend using only select cheats only to assist you in finishing the mission. However, just like with anything else in the world, excessive use of cheats might suck out the entertainment value of the game. The ability to give yourself the upper-hand intense situations can give you a boost of confidence to get the job done. Let’s face it, Liberty City is a bit more exciting when you activate GTA 4 cheats for PS3.