468-555-0100 Change weather
486-555-0150 Get a different selection of weapons
486-555-0100 Get a selection of weapons
267-555-0150 Raise wanted level
267-555-0100 Remove wanted level
362-555-0100 Restore armour
482-555-0100 Restore health
948-555-0100 Song information
227-555-0142 Spawn a Cognoscenti
227-555-0175 Spawn a Comet
938-555-0100 Spawn a Jetmax
625-555-0150 Spawn a Sanchez
227-555-0168 Spawn a SuperGT
227-555-0147 Spawn a Turismo
359-555-0100 Spawn an Annihiliator
227-555-0100 Spawn an FIB Buffalo
625-555-0100 Spawn an NRG-900

Map Locations

Enter this password into the in-game computers to find some cool pick-ups around the city.

www.whattheydonotwantyoutoknow.com = Weapon, health, armor, vehicle, pigeon, ramp/stunt, and entertainment locations

Unlockables

Achievements

Perform the required task to unlock the achievement.

Assassin's Greed: Complete all 9 assassin missions / 20 points
auf Wiedersehen Petrovic: Win all ranked multiplayer variations, all races and Cops 'n Crooks, as both sides / 30 points
Chain Reaction: Blow up 10 vehicles in 10 seconds / 20 points
Cleaned The Mean Streets: Capture 20 criminals through the police computer / 20 points
Courier Service: Complete all 10 package delivery jobs / 10 points
Cut Your Teeth: Earn a personal rank promotion in multiplayer / 5 points
Dare Devil: Complete 100% of the unique stunt jumps / 30 points
Dial B for Bomb: Unlock the special ability of phoning for a bomb to be placed / 10 points
Driving Mr. Bellic: Unlock the special ability of taxi / 10 points
Endangered Species: Collect every hidden package / 50 points
Fed The Fish: Complete the mission "Uncle Vlad" / 5 points
Finish Him: Complete 10 melee counters in 4 minutes / 15 points
Fly The Co-op: Beat Rockstars time in ranked versions of Deal Breaker, Hangman's NOOSE, and Bomb da Base II / 15 points
Full Exploration: Unlock all the islands
Genetically Superior: Come first in 20 singleplayer street races / 25 points
Gobble Gobble: Score 3 strikes in a row, a turkey, in 10-pin bowling / 10 points
Gracefully Taken: Complete mission "I'll Take Her" / 10 points
Half Million: Reach a balance of $500,000 / 55 points
Impossible Trinity: Complete mission "Museum Piece" / 10 points
It'll Cost Ya: Complete a taxi ride without skipping from one island to another / 5 points
Join The Midnight Club: Win a ranked multiplayer race without damaging your vehicle too much and have damage enabled / 10 points
Key To The City: Achieve 100% in "Game progress" statistic / 100 points
King of QUB3D: Beat the High Score in QUB3D / 15 points
Let Sleeping Rockstars Lie: Kill a Rockstar developer in a ranked multiplayer match / 10 points
Liberty City (5): After you meet all friends, the ones left alive like you above 90% / 20 points
Liberty City Minute: Complete the story missions in less than 30 hours / 30 points
Lowest Point: Complete mission "Roman's Sorrow" / 5 points
Manhunt: Complete the most wanted side missions from police computer / 15 points
No More Strangers: Meet all random characters / 5 points
Off The Boat: Complete the first mission / 5 points
One Hundred And Eighty: In a game of darts score 180 with only 3 darts / 10 points
One Man Army: Survive 5 minutes on 6 star wanted level / 40 points
Order Fulfilled: Complete all 10 Exotic Export orders / 10 points
Pool Shark: Beat a friend at pool / 10 points
Retail Therapy: Unlock the ability to buy guns from a friend / 10 points
Rolled Over: Do 5 car rolls in a row from one crash / 30 points
Sightseer: Fly on all helicopter tours of Liberty City / 5 points
Taking It For The Team: Be on the winning team in all ranked multiplayer games / 10 points
Teamplayer: Kill 5 players who are not in your team, in any ranked multiplayer team game / 10 points
That Special Someone: Complete the mission "That Special Someone" / 10 points
That's How We Roll!: Unlock the special ability of helicopter / 10 points
Top Of The Food Chain: Kill 20 players with a pistol in a ranked multiplayer deathmatch / 10 points
Top The Midnight Club: Come first in 20 different ranked standard multiplayer races / 20 points
Under the Radar: Fly underneath the main bridgs in the game that cross water with a helicopter / 40 points
Walk Free: Lose a 4 star wanted level by outrunning the cops / 50 points
Wanted: Achieve the highest personal rank in multiplayer / 20 points
Warm Coffee: Successfully date a girl to be invited into her house / 5 points
Wheelie Rider: Do a wheelie lasting at least 500 feet on a motorbike / 30 points
You Got The Message: Deliver all 30 cars ordered through text messages / 20 points
You Won!: Complete the final mission / 60 points

Other Unlockables

Annihilator Helicopter / Kill all 200 Flying Rats
Rastah Color Huntley SUV / Complete 10 Package Delivery missions

Secrets

Easy money

Go to an ATM, then cause a traffic jam to the area. Wait for someone to take money from the ATM, then kill him or her. Make sure to block any nearby roads so the ambulance cannot get to the murdered victim. Take the money they dropped on the ground. Then, run a short distance away, and go back. The money should have respawned on the ground. You can repeat this as many times as desired. You can also kill more people taking their money from the ATM to increase the amount of money that respawns.

Repairing the engine

If the vehicle you are driving breaks down and the engine will not start, call 911, and your engine should start again.

Get a Statue of Liberty T-shirt

Go to the Statue of Liberty and walk up to the second level. Walk through the door (it doesn't swing open, just go through it) and the game will load for a second and you will walk out with a new t-shit with the Statue of Liberty on it.

Easter Eggs

The Heart of Liberty City

First, you'll have to have access to Happiness Island. Once you're able to go there legally, find the Helicopter Tours (which is directly east of Happiness Island) and steal a helicopter. Fly to Happiness Island and over the Statue of Liberty, then jump out of the helicopter at the statue's feet. You should land on the topmost tier of the statue, which is basically a square platform with a door in the center of each side. Run around the platform until you see a door with a plaque on either side of it that reads, "No Hidden Content Here." It may seem like you cannot go through the door, but you can -- it doesn't open, you simply walk THROUGH the door. Inside, you'll find an empty room with a tall ladder. Climb it, and when you reach the top, look up; there is a gigantic beating heart, held in place by chains.

Friendship Bonuses

Need a lift? How about some backup from the homies? Here's what friendship can buy in GTA IV.

Boom? (Call Packie for him to make you a car bomb) = Gain 75% friendship with Packie
Chopper Ride (He will pick you up in his helicopter) = Gain 70% Friendship with Brucie
Discount Guns (Buy weapons at a cheaper price from Lil Jacob) = Gain 60% friendship with Little Jacob
Extra Help (A car of gang members will be sent to help you out) = Gain 60% friendship with Dwayne
Free Ride (Call for a taxi) = Gain 60% friendship with Roman