Grand Theft Auto IV Cheats

Learn how to do vehicle skating in GTA4.

Want to unlock a vehicle?
  Annihilator (Helicopter) - (359)-555-0100
  Cognoscenti (Car) - (227)-555-0142
  Comet (Car) - (227)-555-0175
  FIB Buffalo (Car) - (227)-555-0100
  Jetmax (Boat) - (938)-555-0100
  NRG-900 (Motorcycle) - (625)-555-0100
  Sanchez (Motorcycle) - (625)-555-0150
  Super GT (Car) - (227)-555-0168
  Turismo (Car) - (227)-555-0147
To start a stalled car, dial 911 on your cell phone and dial 911 and try it again while it's ringing.

Try dialing GTA-555-0100 on Niko's cell phone. (blocks "Cleaned The Mean Streets" achievement)
Busted? Try L1, R1, R2, L2
Need a helicopter? Dial FLY-555-0100.
Delete Niko's wanted level? Dial COP-555-0100.
Add stars to Niko's wanted level? Dial COP-555-0150.
Niko's health and new armour? Dial DOC-555-0100.
Need a gun? Dial GUN-555-0100.
Need a map? At an internet cafe surf to: www.whattheydonotwantyoutoknow.com
Wanna dance? Go to the theater and press Up, Up, Down, Down, Left, Left, Right, Right. Behold, "The Rites of Spring". Now go outside and enjoy the riot.
Change the time and weather? Dial HOT-555-0100.
Wanna Sultan RS? Look in the NE part of the final island in the bushes behind the small shack up a dirt road.

Niko's cell phone shows the same time as the clock in his apartment.

Bean Machine Coffee: 555-0110
Express Car Service: 555-2222
Express Car Service: 555-3333
Fire Proof Doors: 555-5700
Hero Shop: 555-8575
LCPD Recruitment: 555-RECRUIT
Roman Bellic: 718-926-7215
Storage: 555-221-3877
Superb Deli: 555-4674
The Serrated Edge: 1-800-555-5555
Used Auto Parts: 555-7300
Vinewood Laundromat: 555-5123
Zit Song Identifier: Dial "948-555-0100" to get a text message with the name & artist of the song on the radio.