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I have only tried these on PS3 so im not sure if they work on XBOX 360.

Cheat mode

Pause the game, then access the cell phone. Select "Dial", then enter one of the following numbers, including the # symbol, and choose "Call". If you entered the code correctly, a message will appear. Then, go to "Cheats", and select the now unlocked option.

Result Phone number

Player Ability
Full Health #1
Car Mass (increased mass for harder collisions) #2
Milk Bones (increased melee attack damage) #3
Add Police Notoriety (+1 star to police wanted meter) #4
Player Pratfalls (press L1 or R1 to fall) #5
Infinite Sprint #6
Unlimited Clip (never reload, except for RPGs) #9
Infinite Ammo #11
Heaven Bound (killed bodies float upward) #12
Add Gang Notoriety (+1 gang attack level) #35
Never Die #36
No Cop Notoriety #50
No Gang Notoriety #51
I Am Giant (become very tall) #200
Itty Bitty (become very short) #201
Give Cash (gain $1,000) #2274666399

Vehicles
Repair Car (fixes car, boat, and helicopter damage) #1056
Ambulance #1040
Anchor #1041
Atlasbreaker #1042
Attrazione #1043
Backdraft #1044
Backhoe #1045
Bag Boy #1046
Baron #1047
Bear #1048
Bootlegger #1049
Bulldog #1050
Bulldozer #1051
Compton #1052
Eiswolf #1053
FBI #1054
Five0 #1055
Hollywood #1057
Justice #1058
Kent #1059
Mag #1060
Mixmaster #1061
Mongoose #1062
Oring #1063
Phoenix #1064
Quasar #1065
Quota #1066
Rampage #1067
Raycaster #1068
Reaper #1069
Septic Avenger #1070
Shaft #1071
Stilwater Municipal #1072
Superiore #1073
Taxi #1074
The Job #1075
Titan #1076
Toad #1077
Varsity #1078
Venom Classic #1079
Vortex #1080
Zenith #1081
Horizon (commerical helicopter) #711
Snipes57 (executive private jet) #712
Tornado (police helicopter with minigun and anti-tank missiles; can lock onto other vehicles or be manually aimed) #713
Wolverine (P-51 Mustang-style airplane with machine gun) #714
Kaneda (custom street racing motorcycle) #801
Kenshin (street racing motorcycle) #802
Melbourne (Harley-style motorcycle) #803
Sabretooth (custom Harley-style motorcycle) #804
Sandstorm (dirtbike) #805
Widowmaker (moped) #806
Hurricane (speedboat) #825
Miami #826
Python #827
Shark (personal watercraft) #828
Skipper (yacht) #829

Retailer Promotion Vehicles
Gyro Daddy helicopter (two person mini-helicopter) #4976
Destroy UFO (two person flying saucer) #728237
Peewee mini-bike (very small mini-bike) #7266837

Weapons
12 Gauge #920
44 Shepherd #921
AR200 (SAW-type machine gun) #922
AR50 (X8-type assault rifle) #923
AR50 Launcher (X8-type assualt rifle with grenade launcher) #924
AS14 (fully automatic shotgun) #925
Baseball Bat #926
Chainsaw #927
Fire Extinguisher #928
Flamethrower #929
Flashbang #930
GAL43 (Uzi-like sub-machine gun) #931
GDHC #932
Grenade #933
Holt 55 (fully automatic pistol) #934
K6 Krukov #935
Knife #936
Machete #937
McManus2010 #938
Minigun #939
Molotov #940
Nightstick #941
NR4 #942
Pepper Spray #943
Pimp Cane (shotgun) #944
Pipe Bomb #945
RPG #946
RPG Annihilator (manual or lock-on guided RPG) #947
Samurai Sword #948
Satchel #949
Shock Paddles (bring dead people back to life) #950
SKR-9 #951
Sledgehammer #952
Stungun (semi-automatic Taser-style weapon; can kill if used repeatedly) #953
T3K Urban #954
Tire Iron #955
Tombstone #956
Vice 9 #957
XS-2 (fully automatic shotgun) #958
Pimp Slap (big foam middle finger) #969

Weather
Wrath of God (thunderstorm with random lightning strikes) #666
Overcast #78665
Heavy Rain #78666
Light Rain #78668
Clear Skies #78669
Normal Weather #78670

World
Super Explosions #7
Super Saints (almost invincibile Homies and Saints with better weapons) #8
Drunk Pedestrians #15
Evil Cars (drivers try to run you down) #16
Low Gravity (cannot be used with helicopters; use in Insurance Fraud mode to glide) #18
Pedestrian War (pedestrians and drivers fight each other) #19
Raining Pedestrians (people spawn and fall from sky but die on the ground) #20
Everybody Must Get Shrunk (everyone is very short) #202
Time Set Noon (hour set to 12 p.m. with minutes unchanged) #1200
Time Set Midnight (hour set to 12 a.m. with minutes unchanged) #2400


Service phone numbers
Pause the game, then access the cell phone. Select "Dial", then enter one of the following numbers, and choose "Call" to call the corresponding service:

Service Phone number
Airport 5553597
Big Willy's Cab 8198415
Bling Bling 5554233
Brown Baggers 5553765
Cocks 5552626
Company of Gyros 5554976
Cycles 5552453
EagleLine Yellow 0180174
Emergency 911
Eye for an Eye (Zombie Carlos) 5555966
Foreign Power 5552046
Forgive and Forget 5554448
Freckle Bitch's 5556328
Friendly Fire 5554867
Fire Department 5553473
Giftshop 5557577
HazMat 5556677
Image as Designed 5558459
Impression 5553248
Leather and Lace 5552662
Legal Lee's 5559467
On The Rag 5555926
On Thin Ice 5552564
Police 5557973
Pimps 'R Us 5557467
Rim Jobs 5553493
Rusty's Needle 5558287
Ship It 5557447
Spelunkers 5552283
Suicide Hotline 4876837
Tee'N'Ay 5559866
TNA Taxis 4558008
Ultor Security 411


Infinite respect
Successfully complete enough activities to raise your respect over level 99.

Unlockables
Successfully complete the indicated task to unlock the corresponding reward:

Abilities

Brotherhood notoriety reduced (5%): Successfully complete Trail Blazing, Level 3 in Apartments.
Brotherhood notoriety reduced (15%): Successfully complete Trail Blazing, Level 6 in Apartments.
Health regeneration 2x: Successfully complete Snatch, Level 3 in Chinatown.
Health regeneration 3x: Successfully complete Snatch, Level 6 in Chinatown.
Improved weapon accuracy (5%): Successfully complete Septic Avenger, Level 3 in Suburbs.
Improved weapon accuracy (15%): Successfully complete Septic Avenger, Level 6 in Suburbs.
No fall damage: Land a perfect base jump.
Police notoriety reduced (5%): Successfully complete Fuzz, Level 3 in Suburbs.
Police notoriety reduced (15%): Successfully complete Fuzz, Level 6 in Suburbs.
Pumped up (increased melee damage): Successfully complete Fight Club, Level 3 in Arena.
Pumped up (more increased melee damage): Successfully complete Fight Club, Level 6 in Arena.
Reduced bullet damage (5%): Successfully complete Heli Assault, Level 3 in Bario.
Reduced bullet damage (15%): Successfully complete Heli Assault, Level 6 in Bario.
Reduced explosion damage (5%): Successfully complete Trail Blazing, Level 3 in Downtown.
Reduced explosion damage (15%): Successfully complete Trail Blazing, Level 6 in Downtown.
Reduced vehicle damage (5%): Successfully complete Insurance Fraud, Level 3 in Museum.
Reduced vehicle damage (15%): Successfully complete Insurance Fraud, Level 6 in Museum.
Ronin notoriety reduced (5%): Successfully complete Drug Trafficking, Level 3 in Hotel and Marina.
Ronin notoriety reduced (15%): Successfully complete Drug Trafficking, Level 6 in Hotel and Marina.
Sons Of Samedi notoriety reduced (5%): Successfully complete Snatch, Level 3 in University.
Sons Of Samedi notoriety reduced (15%): Successfully complete Snatch, Level 6 in University.
Sprint increased: Successfully complete Insurance Fraud, Level 3 in Factories.
Sprint increased (unlimited): Successfully complete Insurance Fraud, Level 6 in Factories.
Customization Items

Avenger jacket: Get a "3 Gold Star" rank in Gang Kills.
Bodyguards gang style: Progress through the game.
Brotherhood personality: Successfully complete Brotherhood, Mission 11.
Chop shop: Successfully complete one Chop Shop list.
Fireman outfit: Successfully complete the Firefighter missions.
Free Music track: Collect 10 CDs.
Free Music track: Collect 20 CDs.
Free Music track: Collect 30 CDs.
Free Music track: Collect 40 CDs.
Free Music track: Collect all 50 CDs.
Ninjas gang style: Progress through the game.
Paintball mask: Perform 30 muggings.
Pimp suit: Successfully complete Ho-ing, Level 10 in Red Light District.
Red Light apartment crib: Successfully complete Prologue, Mission 2.
Ronin personality: Successfully complete Ronin, Mission 11.
Saints hideout: Successfully complete Prologue, Mission 3.
Samedi personality: Successfully complete Sons Of Samedi, Mission 11.
Traffic cone hat: Get a "3 Gold Star" rank in Vehicle Surfing.
Zombie mask: Successfully complete Zombie Uprising.
Fighting Styles

Brotherhood melee: Successfully complete Brotherhood, Mission 6.
Ronin melee: Successfully complete Ronin, Mission 6.
Samedi melee: Successfully complete Sons Of Samedi, Mission 6.
Homies

One follower: Successfully complete Prologue, Mission 4.
Two followers: Reach 25% hoods conquered.
Three followers: Reach 50% hoods conquered.
Johnny Gat: Successfully complete Ronin, Mission 11.
Legal Lee: Successfully complete Fight Club, Level 3 in Prison.
News reporter: Perform 50 muggings.
Pierce: Successfully complete Brotherhood, Mission 11.
Shaundi: Successfully complete Sons Of Samedi, Mission 11.
Tobias: Successfully complete Sons Of Samedi, Mission 3.
Troy: Successfully complete Fight Club, Level 6 in Prison.
Vehicle delivery for $1,000: Successfully complete Escort, Level 3 in Red Light District.
Vehicle delivery for free: Successfully complete Escort, Level 6 in Red Light District.
Zombie Carlos: Successfully complete all Brotherhood missions, then call Eye For An Eye.
Store Discounts

Clothing store (5%): Successfully complete Crowd Control, Level 3 in Suburbs.
Clothing store (15%): Successfully complete Crowd Control, Level 6 in Suburbs.
Crib customization (5%): Successfully complete Mayhem, Level 3 in Red Light District.
Crib customization (15%): Successfully complete Mayhem, Level 6 in Red Light District.
Food and Liquor store (5%): Successfully complete Septic Avenger, Level 3 in Red Light District.
Food and Liquor store (15%): Successfully complete Septic Avenger, Level 6 in Red Light District.
Mechanic (5%): Successfully complete Demo Derby, Level 3.
Mechanic (15%): Successfully complete Demo Derby, Level 6.
Mechanic (75%): Successfully complete all five Chop Shop lists.
Scratch That music store (free): Collect all 50 CDs.
Weapon store (5%): Successfully complete Heli Assault, Level 3 in Trailer Park.
Weapon store (15%): Successfully complete Heli Assault, Level 6 in Trailer Park.
Vehicles

Akuji's prototype bike: Successfully complete Ronin, Mission 11.
Attack helicopter: Successfully complete Epilogue, Mission 4.
Bandit: Successfully complete 15 stunt jumps.
Brotherhood vehicles: Successfully complete Brotherhood, Mission 11.
Buggy: Successfully complete one Chop Shop list.
Combine: Successfully complete two Chop Shop lists.
Demolition derby vehicles: Successfully complete Demolition Derby, Level 6 in University.
Donnie's vehicle: Successfully complete Brotherhood, Mission 2.
Escort vehicles: Successfully complete both Escort instances.
Gang customization cars: Reach 15% hoods conquered.
Gang customization cars (more): Reach 45% hoods conquered.
Gang customization cars (even more): Reach 65% hoods conquered.
The General's Bulldog (Hummer with infinite chaingun ammo): Successfully complete Sons of Samedi, Mission 11.
Julius' car: Successfully complete Bonus Mission 1.
Maero's Monster Truck: Successfully complete Brotherhood, Mission 11.
Medical helicopter: Successfully complete Ronin, Mission 7.
News helicopter: Successfully complete Sons Of Samedi, Mission 3.
Ronin vehicles: Successfully complete Ronin, Mission 11.
Saints ambulance: Successfully complete all Ambulance missions.
Saints fire truck: Successfully complete all Firefighter missions.
Saints plane: Successfully complete all plane events.
Saints tow truck: Successfully complete all Tow Truck missions.
Saints yacht: Successfully complete all boat events.
Septic truck: Successfully complete both Septic Avenger instances.
Sons Of Samedi vehicles: Successfully complete Sons of Samedi, Mission 11.
Special Bezier: Win all vehicle races.
Super Taxi: Successfully complete all taxi missions.
Tornado attack helicopter: Successfully complete the final mission of the Ultor epilogue.
Ultor APC: Successfully complete Epilogue, Mission 2.
Weapons

Annihilator RPG: Successfully complete Mayhem, Level 6 in Nuclear Power Plant.
AR-50 XMAC Special (with grenade launcher): Successfully complete all Combat Tricks.
Chainsaw: Successfully complete Crowd Control, Level 6 in Hotel and Marina.
Defibrillator: Successfully complete all Ambulance missions.
Flamethrower: Successfully complete Mayhem, Level 3 in Nuclear Power Plant.
GAL 43: Successfully complete Snatch, Level 3 in Downtown.
Grenades at crib: Successfully complete one Hitman list.
Kobra pistol: Successfully complete Fuzz, Level 3 in Projects.
Minigun: Successfully complete Brotherhood, Mission 10.
Pepper spray: Successfully complete Crowd Control, Level 3 in Hotel and Marina.
Pimpcane: Successfully complete Epilogue, Mission 2.
Satchel Charges at crib: Successfully complete three Hitman lists.
X2 Ultimax shotgun: Successfully complete Drug Trafficking, Level 3 in Airport.
Infinite pistol ammo: Successfully complete Fuzz, Level 6 in Projects.
Infinite rifle ammo: Successfully complete all Hitman lists.
Infinite shotgun ammo: Successfully complete Drug Trafficking, Level 6 in Airport.
Infinite SMG ammo: Successfully complete Snatch, Level 6 in Downtown.

Entering vehicles faster
Stand on top of a vehicle and press Triangle. You will instantly be in the car.

ahh... i was just about to post this..

WHOA! thats a lot, good post billy.