Tier 2 Weapons (Bat, Grenades, MP5, Carbine) Tier 1 Weapons (Knife, Molotov, Uzi, AK-47) Many of these cheat codes will prevent specific achievements / trophies from unlocking, so make sure you save your game before entering cheats. Once entered into the phone, you will retain the code under the Cheats menu in your cell phone for later use.
Some of the most exciting of these GTA 4 cheats can be entered by bringing up Niko's cell phone and dialing in the numbers.
