Internet Cafe Cheats
Head into one of the Internet cafes in Liberty City and enter one of these URLs to activate the listed cheat. Input "www.littlelacysurprisepageant.com" for an automatic wanted level of five stars for those times when you need the police on your tail. Type "www.whattheydonotwantyoutoknow.com" to see the location of important items such as weapons, health and armor on the map. Get themes and ringtones for Niko's cell phones by entering "www.vipluxuryringtones.com."
Cell Phone Cheats
Use Niko's cell phone to activate additional cheats. Just dial a number to activate the cheat. Call "482-555-0100" to refill Niko's armor, health and ammunition. Give him some new weapons by dialing "486-555-0100." Remove his wanted level with the code "267-555-0100." Use these cheats to spawn several vehicles for use in the game. Use the code "227-555-0168" to get a SuperGT, "227-555-0175" for a Comet, "359-555-0100" for an Annihiliator and "938-555-0100" for a Jetmax.
Easy Cash
Find an ATM in the game and then block traffic with a vehicle. Wait until a person withdraws money from the ATM and then kill him. He will drop his money on the ground and you can pick it up. As long as an ambulance can't get to the victim his body will remain. Run away a short distance and then return. More money should be on the ground. You can kill multiple people to earn money in this way faster.
Instant Mechanic
If your car breaks down, use a glitch to get back on the road quickly. Just pull out Niko's phone and dial any number. The vehicle should start thanks to the engine's miraculous recovery when you return to the game screen.
Making Friends
Complete tasks for individuals in the game to increase your friendship level with them. Boost this level enough and you will earn some bonuses. For example, if you gain 60 percent friendship with Little Jacob, he will sell you weapons at a lower price. Earn the same level of friendship with Roman and you can ride in taxis for free. Packie will make a car bomb for you if you gain a 75 percent friendship level with him.