PlayStation 2 Controls

Start - Regardless of whether you're on foot or in a vehicle the start button is the pause button. When the game is paused it brings up your menu which you can cycle through and change various options or look at your statistics.

Select - The select button basically controls the camera for everything, there are three different camera distances you can choose from when running around on foot and various different types of camera for your vehicles as well.

D-pad - The D-pad does not move you or steer your cars in this game. When you're on foot the d-pad is used to recruit gang members if you have that ability, walk up to one of them and target with R1 then press either up or down to recruit. In conversation pressing either left or right responds positively or negatively respectively. In car it changes radio stations.

On Foot

TRIANGLE - Enter/exit vehicles, Active Mini-Game, Punch/Kick, Pick up/Activate object, End Cellular Call.
CIRCLE - Fire weapon.
X (HOLD) - Run
X (TAP RAPIDLY) - Sprint
SQUARE - Block, climb/jump.
L1 - View stats, fire weapon.
L2 - Cycle through weapons. Cycle through targets. Zoom in(sniper/camera)
R1 - Lock on target. Enter scoop view on sniper.
R2 - Cycle through weapons. Cycle through targets. Zoom in(sniper/camera)
L3 - Move Carl.
L3(TAP) - Duck
R3 - Move cross hairs(while holding R1).
R3(HOLD) - Look behind.

Swimming

X(HOLD) - Swim
X(TAP) - Swim faster
Circle - Dive underwater
Square - Jump

Bicycle

Triangle - Get of Bike
X(HOLD) - Pedal
X(TAP) - Pedal faster
L1 - Bunnyhop
L1(HOLD & Release - Bunnyhop Higher

In a Vehicle/Motorbike

Triangle - Exit vehicle
Circle - Fire weapon/nitrous
X - Accelerate
Square - Brake
L1 - Fire weapon/nitrous
L2 - Look left
R1 - Hand Brake
R2 - Look right
R2+L2 - Look behind
L3 - Horn
R3 - Vehicle Mission(certain vehicles)
D-Pad UP - Change radio station
D-Pad DOWN - Change radio station

Plane

X - Thrust
Square - Reverse thrust
L2 - Move rudder left
R2 - Move rudder right

Helicopter

X - Ascend height
Square - Descend height
L2 - Move rudder left
R2 - Move rudder right
L3 - Hover
Left analog stick(tilted forward) - Move forward