While in the game, press BACK to bring up your phone. Go to "Extras", then select "Cheats". After that, select "Add Cheat", and use the following list below. WARNING: Cheating will disable autosave and achievements.

Code	Effect
unlockitall	All Unlockables
goodygoody	clear notoriety
runfast	infinite sprint
vroom	vehicle no damage
letsrock	weapons
cheese	give cash