Thread: GTA IV Cheats

Change Weather & Time of Day
To randomly change the weather and time of day, break out your cell phone and insert the following number: (468)-555-0100.
Adjust Your Wanted Level
To get rid of Niko's wanted level, insert the following number into your cell phone: (267)-555-0100. To add stars to Niko's wanted level, insert this number instead: (267)-555-0150. Keep in mind that this will disable your ability to acquire some achievements.
All Secret Locations
Head to the internet café (or wherever you can access the internet) and insert the URL [Only Registered users can see links . Click Here To Register...]. If inserted properly, you'll be brought to an in-game message board containing maps of secret locations in the game. Check it out!
Refill Health, Armor & Ammo
To refill Niko's health and to give him some fresh armor, insert the following number into your cell phone: (362)-555-0100. If you want to give him health, fresh armor and refill all ammunition, insert this number instead: (482)-555-0100. Keep in mind that this will disable your ability to acquire some achievements.
Spawn Cars
Any time you're outside, break out your cell phone and insert the following phone numbers to unlock the vehicles listed.
* 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 (Car) - (625)-555-0150
* Super GT (Car) - (227)-555-0168
* Turismo (Car) - (227)-555-0147
Weapon Batch 1
To unlock a baseball bat, grenades, M4, MP5, pistol, RPG and sniper rifle, insert the following number into your cell phone: (486)-555-0100. Keep in mind that this will disable your ability to acquire some achievements.
Weapon Batch 2
To unlock an AK-47, knife, Molotov Cocktails, pistol, RPG, sniper rifle and Uzi, insert the following number into your cell phone: (486)-555-0150. Keep in mind that this will disable your ability to acquire some achievements.

Lot of them already know about these. Please try post rare or unknown cheat Or Post hidden secret in GTA IV