There is a cheat device which you can use to acquire a helicopter and that is Edison Carter cheat device. You can download the cheat device in this website. (click
here)
Here is a list of cheats for GTA Liberty City for PlayStation Portable (PSP) :
Cheats Note: Some cheats cannot be toggled. Save your game before trying them or you may get stuck with a cheat you don't want!
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
Source :
http://wiki.answers.com/Q/What_is_the_cheat_for_helicopter_on_Grand_Theft_Auto_Liberty_City_Stories#ixzz1GCgmAJdV
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