Punch the follow cheats into your cell phone during the game. Then go to your cheat menu in your cell and access whichever cheat(s) you punched in.
Akuma Bike: 625-555-0200
Poor Weapons: 486-555-0150
APC Tank: 272-555-8265
New Advanced Weapons: 486-555-0100
Buzzard Helicopter: 359-555-2899
Vader Bike: 625-555-3273
Change Weather: 468-555-0100
Super Exploding Punch: 276-555-2666
Floater Boat: 938-555-0150
Spawn FIB Buffalo: 227-555-0100
Health and Armor: 362-555-0100
Spawn Turismo: 227-555-0147
Health, Advanced Weapons, and Armor: 482-555-0100
Spawn Super GT: 227-555-0168
Parachute: 359-555-7272
Spawn Sanchez: 625-555-0150
Raise Wanted Level: 267-555-0150
Remove Wanted Level: 267-555-0100
Spawn NRG-900: 625-555-0100
Sniper Rifle Bullets Explode: 486-555-2526
Spawn Jetmax: 938-555-0100
Spawn Annihilator: 359-555-0100
Spawn Comet: 227-555-0175
Spawn Bullet GT: 227-555-9666
Spawn Cognoscenti: 227-555-0142