GTA 4 The Ballad of Gay Tony cheats can be activated by entering one of these numbers into your cellphone, like you are calling that number.
Each time you activate some cheat codes, "Cheat Activated" message will appear.
Be aware that every attempt of cheating will be archived by game engine, and can be seen at the game statistics.
Also, cheating may affect some missions, as well as achievements.
362-555-0100 - Health and Armour
482-555-0100 - Health, Armour and Weapons
486-555-0100 - Aditional Weapons
276-555-2666 - Super Punch
468-555-0100 - Change Weather
359-555-7272 - Parachute
267-555-0150 - Wanted Level Up
267-555-0150 - Wanted Level Down
486-555-2526 - Exploding Sniper Bullets
625-555-3273 - Vader Motorcycle
625-555-0200 - Akuma Motorcycle
272-555-8265 - APC Tank
359-555-2899 - Buzzard Helicopter
938-555-0150 - Floater Boat
359-555-0100 - Annihilator
227-555-9666 - Bullet GT
227-555-0142 - Cognoscenti
227-555-0175 - Comet
938-555-0100 - Jetmax
625-555-0100 - NRG-900
625-555-0150 - Sanchez
227-555-0168 - Super GT
227-555-0147 - Turismo
227-555-0100 - FIB Buffalo