Options
Num 1 – Infinite Health
Num 2 – Infinite Armor
Num 3 – Infinite Stamina
Num 4 – Infinite Ammo & Grenades 
Num 5 – No Reload
Num 6 – Freeze Daytime
Num 7 – Fast Forward Daytime
Num 8 – Edit Money
Num 9 – Edit Wanted Level
Num 0 – Set Game Speed
Alt+Num 1 – Freeze Mission Timer
Alt+Num 0 – Freeze Rampage Challenge Timer
Alt+Num 2 – Infinite Vehicle Health
Alt+Num 3 – Teleport To Waypoint
Game Built In Cheat Options
Ctrl+Num 1 – Receive Weapon Set #1
Ctrl+Num 2 – Receive Weapon Set #2
Ctrl+Num 3 – Receive Weapon Set #3
Ctrl+Num 4 – Armed Pedestrians
Ctrl+Num 5 – Angry Pedestrians
Ctrl+Num 6 – Rioting Pedestrians
Ctrl+Num 7 – Attract Female Pedestrians
Ctrl+Num 8 – Big Head Mode
Ctrl+Num 9 – Change Weather
Ctrl+F1 – Spawn Tank
Ctrl+F2 – Spawn Plane
Ctrl+F3 – Spawn Helicopter
Ctrl+F4 – Spawn Random Cars
Ctrl+F5 – Improved Vehicle Handling
Ctrl+F6 – Flying Cars
Ctrl+F7 – Cars Can Drive On Water
Ctrl+F8 – Aggressive Traffic
Ctrl+F9 – All Traffic Lights Turn Green