Note: These are direct prints from the game's internal files. There is no L1 or R1 for the PSP, but these refer to the PSP L and R shoulder keys repsectively. Also, some cheats cannot be toggled. Save your game before trying them or you may get stuck with a cheat you don't want!
GTA:LCS
Weapon Set 1
UP, SQUARE, SQUARE, DOWN, LEFT, SQUARE, SQUARE, RIGHT

Weapon Set 2
UP, CIRCLE, CIRCLE, DOWN, LEFT, CIRCLE, CIRCLE, RIGHT

Weapon Set 3
UP, X, X, DOWN, LEFT, X, X, RIGHT

Get $250000
L1, R1, TRIANGLE, L1, R1, CIRCLE, L1, R1

Restore Armor
L1, R1, CIRCLE, L1, R1, X, L1, R1

Restore Health
L1, R1, X, L1, R1, SQUARE, L1, R1

Increase Wanted Level
L1, R1, SQUARE, L1, R1, TRIANGLE, L1, R1

Wanted Level Never Appears
L1, L1, TRIANGLE, R1, R1, X, SQUARE, CIRCLE

Weather: Sunny
L1, L1, CIRCLE, R1, R1, SQUARE, TRIANGLE, X

Weather: Clear
UP, DOWN, CIRCLE, UP, DOWN, SQUARE, L1, R1

Weather: Overcast
UP, DOWN, X, UP, DOWN, TRIANGLE, L1, R1

Weather: Rainy
UP, DOWN, SQUARE, UP, DOWN, CIRCLE, L1, R1

Weather: Foggy
UP, DOWN, TRIANGLE, UP, DOWN, X, L1, R1

Spawn Rhino
L1, L1, LEFT, L1, L1, RIGHT, TRIANGLE, CIRCLE

Faster Clock
L, L1, LEFT, L1, L1, RIGHT, CIRCLE, X

Destroy All Cars
L, L1, LEFT, L1, L1, RIGHT, X, SQUARE

Random Pedestrian Outfit
L, L1, LEFT, L1, L1, RIGHT, SQUARE, TRIANGLE

Pedestrian Riot
L1, L1, R1, L1, L1, R1, LEFT, SQUARE

Pedestrians Attack You
L1, L1, R1, L1, L1, R1, UP, TRIANGLE

Pedestrians All Have Weapons
R1, R1, L1, R1, R1, L1, RIGHT, CIRCLE

Faster Gameplay
R1, R1, L1, R1, R1, L1, DOWN, X

Slower Gameplay
R1, TRIANGLE, X, R1, SQUARE, CIRCLE, LEFT, RIGHT

Perfect Traction, Down=Car Hop
L1, UP, LEFT, R1, TRIANGLE, CIRCLE, DOWN, X

Media Attention Meter
L1, UP, RIGHT, R1, TRIANGLE, SQUARE, DOWN, X

Commit Suicide
L1, DOWN, LEFT, R1, X, CIRCLE, UP, TRIANGLE

All Green Lights
TRIANGLE, TRIANGLE, R1, SQUARE, SQUARE, L1, X, X

Aggressive Drivers
SQUARE, SQUARE, R1, X, X, L1, CIRCLE, CIRCLE

White Traffic
X, X, R1, CIRCLE, CIRCLE, L1, TRIANGLE, TRIANGLE

Black Traffic
CIRCLE, CIRCLE, R1, TRIANGLE, TRIANGLE, L1, SQUARE, SQUARE

Spawn Trashmaster
TRIANGLE, CIRCLE, DOWN, TRIANGLE, CIRCLE, UP, L1, L1

Cars Drive On Water
CIRCLE, X, DOWN, CIRCLE, X, UP, L1, L1

Unknown
X, SQUARE, DOWN, X, SQUARE, UP, R1, R1

Follow Me
DOWN, DOWN, DOWN, TRIANGLE, TRIANGLE, CIRCLE, L1, R1

Bobble Head World
DOWN, DOWN, DOWN, CIRCLE, CIRCLE, X, L1, R1

Upside Down
DOWN, DOWN, DOWN, X, X, SQUARE, R1, L1

Upside Down
X, X, X, DOWN, DOWN, RIGHT, L1, R1

Unknown
UP, UP, UP, SQUARE, SQUARE, TRIANGLE, R1, L1

Unknown
UP, UP, UP, CIRCLE, CIRCLE, X, L1, R1

Unknown
UP, UP, UP, X, X, SQUARE, R1, L1

Unknown
UP, UP, UP, TRIANGLE, TRIANGLE, CIRCLE, L1, R1

Change Bike Tire Size
CIRCLE, RIGHT, X, UP, RIGHT, X, L1, SQUARE

Display Game Credits
L1, R1, L1, R1, UP, DOWN, L1, R1

All Vehicles Chrome Plated
TRIANGLE, R1, L1, DOWN, DOWN, R1, R1, TRIANGLE
Submitted by Edison Carter
Cheat: Infinite Ammo
Enter CIRCLE, SQUARE, L1, L1, TRIANGLE.
Submitted by RCOOL93
Cheat: Disable Collision Damage
UP, UP, UP, L1, L1, R1, R1, UP, UP, UP. (Unverified)
Submitted by Deano.G7_buzzin
Hint: Money Without Cheating
At Hogs & Cogs on the west side of Stanton you are able to do the "Bike Salesman" mission. This mission is exceptionally easy. After you sell all 40 bikes to complete the mission just continue to sell the faggio's or pcj-600's. For every five sales you get a bonus of $2,500 this amount accumulates. For example: at 200 sales (only took like an hour) you get $100,000 then at 205 sales (like a minuet later) you get an additional $102,500 and so on and so forth. I did this for like two hours and now I have a couple million and I've only completed like 25% of the game.
Submitted by Shipley
Hint: Extra Mission Rewards
Taxi Missions Level 12 - Unlocks Bickle '76
Ambulance Missions Level 12 - Infinite Run
Vigilante Missions Level 12 - Increases Maximum armour by 50%
Firefighter Missions Level 12 - Player is not-flammable (explosions still do damage)
Trash Truck Missions Level 12 - Money
Submitted by Abel LaO

GTA:VCS
Weapon Set 1 ... LEFT, RIGHT, X, UP, DOWN, SQUARE, LEFT, RIGHT
Weapon Set 2 ... LEFT, RIGHT, SQUARE, UP, DOWN, TRIANGLE, LEFT, RIGHT
Weapon Set 3 ... LEFT, RIGHT, TRIANGLE, UP, DOWN, CIRCLE, LEFT, RIGHT
Get $250000 ... UP, DOWN, LEFT, RIGHT, X, X, L1, R1
Armor ... UP, DOWN, LEFT, RIGHT, SQUARE, SQUARE, L1, R1
Health ... UP, DOWN, LEFT, RIGHT, CIRCLE, CIRCLE, L1, R1
Raise Wanted Level ... UP, RIGHT, SQUARE, SQUARE, DOWN, LEFT, CIRCLE, CIRCLE
Never Wanted ... UP, RIGHT, TRIANGLE, TRIANGLE, DOWN, LEFT, X, X
Sunny Weather ... LEFT, DOWN, R1, L1, RIGHT, UP, LEFT, CIRCLE
Clear Weather ... LEFT, DOWN, R1, L1, RIGHT, UP, LEFT, X
Overcast Weather ... LEFT, DOWN, L1, R1, RIGHT, UP, LEFT, SQUARE
Rainy Weather ... LEFT, DOWN, L1, R1, RIGHT, UP, LEFT, TRIANGLE
Foggy Weather ... LEFT, DOWN, TRIANGLE, X, RIGHT, UP, LEFT, L1
Spawn Rhino ... UP, L1, DOWN, R1, LEFT, L1, RIGHT, R1
Faster Clock ... R1, L1, L1, DOWN, UP, X, DOWN, L1
Destroy All Cars ... L1, R1, R1, LEFT, RIGHT, SQUARE, DOWN, R1
Peds Riot ... R1, L1, L1, DOWN, LEFT, CIRCLE, DOWN, L1
Peds Attack You ... DOWN, TRIANGLE, UP, X, L1, R1, L1, R1
Peds Have Weapons ... UP, L1, DOWN, R1, LEFT, CIRCLE, RIGHT, TRIANGLE
Faster Gameplay ... LEFT, LEFT, R1, R1, UP, TRIANGLE, DOWN, X
Slower Gameplay ... LEFT, LEFT, CIRCLE, CIRCLE, DOWN, UP, TRIANGLE, X
Perfect Traction (Down is Car Hop) ... DOWN, LEFT, UP, L1, R1, TRIANGLE, CIRCLE, X
Commit Suicide ... RIGHT, RIGHT, CIRCLE, CIRCLE, L1, R1, DOWN, X
Aggressive Drivers ... UP, UP, RIGHT, LEFT, TRIANGLE, CIRCLE, CIRCLE, SQUARE
Black Traffic ... L1, R1, L1, R1, LEFT, CIRCLE, UP, X
Spawn Trashmaster ... DOWN, UP, RIGHT, TRIANGLE, L1, TRIANGLE, L1, TRIANGLE
Guys Follow You ... RIGHT, L1, DOWN, L1, CIRCLE, UP, L1, SQUARE
Upside Down ... SQUARE, SQUARE, SQUARE, L1, L1, R1, LEFT, RIGHT
Upside Down ... LEFT, LEFT, LEFT, R1, R1, L1, RIGHT, LEFT
Chrome Cars ... RIGHT, UP, LEFT, DOWN, TRIANGLE, TRIANGLE, L1, R1
Submitted by Edison Carter
Cheat: Cars Avoid You
During the game UP, UP, RIGHT, LEFT, TRIANGLE, CIRCLE, CIRCLE, SQUARE.
Submitted by topheridol
Unlockable: Extra Armor
Finish 15 Levels of Vigilante Sidemissions.
Submitted by femer
Unlockable: Bulletproof Business Vehicles
Acquire all 30 businesses.
Submitted by dezz
these are from a cheat site and not by me. im just sharing my wealth of knowledge lol

Thx. Now i don have to go looking around everywhere for cheats. But i am trying to pass both games without cheats.

thanks man, been looking for some cheats.

woo thankx heaps for the cheatss

Yess Thanks man, too hard for me too pass without cheats

where did u find these its a good job

after you use those cheats it says i cant save anymore, Waaaaahhhhhhhhhhh!