Need for Speed: Undercover Cheats PS3 Cheats,

Challenge Series Cars (DLC Content):
Battle Machine RX-7 - Finish the first 30 Challenge Series Events.
Speed Machine 911GT2 - Finish all 60 Challenge Series Events
Dominator Corvette Z06 - Dominate over 30 Challenges Series Events.

Even More Cars
At the in-game cheats menu:
Die-Cast Audi R8 car - Enter "9:G3IF or "9;&4)%
Die-Cast BMW M3 E92 car - Enter )B7@B=
Die-Cast Dodge Viper SRT10 car - Enter !C6;C>E or ""6<"?$
Die-Cast Lexus IS F car - Enter !7I3JMI or !8(4*-(
Die-Cast Nissan 240SX (S13) car - Enter ?P:COL (that's the letter "O") or @/;#/+
Die-Cast Nissan GT-R (R35) Police Version car - Enter yp}jwa or "90=*6@

More Cars
At the in-game cheats menu:

citwoxq53f - Chevrolet Camaro Concept
qlcukc4bqm - Dodge Charger (1969)
i3kxodepfc - Ford Mustang GT
2d5dviyrlgn - Pontiac GTO (1965)
>8P:I; - Porsche 911 Turbo
NeedForSpeedShelbyTerlingua - Shelby Terlingua

Cars and Money
At the in-game cheats menu enter these:

%%$3/" - $10,000 in-game
0;5M2; - Lexus IS F
-KJ3=E - Lotus Elise
?P:COL - Nissan 240SX
!2ODBJ: - Volkswagen R32
S1D3K1CK - $15,000 in-game

Characters
In the Cantina codes menu:

Admiral Ackbar - ACK646
Battle Droid Commander - KPF958
Boba Fett - LA811Y
Boss Nass - HHY697
Captain Tarpals - QRN714
Count Dooku - DDD748
Darth Maul - H35TUX
Darth Sidious - A32CAM
Ewok - EWK785
General Grievous - PMN576
Greedo - ZZR636
IG-88 - GIJ989
Imperial Guard - GUA850
Jango Fett - KLJ897
Ki Adi Mundi - MUN486
Luminara - LUM521
Padme - VBJ322
R2-Q5 - EVILR2
Sandtrooper - CBR954
Stormtrooper - NBN431
Super Battle Droid - XZNR21
Taun We - PRX482
Vulture Droid - BDC866
Watto - PLL967
Zam Wesell - 584HJF

Unlockable Ships:
From the Cantina, enter the codes option and enter whichever you want.

Imperial Shuttle - HUT845
TIE Interceptor - INT729

Grand Theft Auto IV Cheats-PS3 Cheats

Song IDs
When you want to know the name and artist of a song you're listening to call (948)-555-0100 on Niko's phone. You'll receive a text message back.

Refill Health, Armor & Ammo
Instead of having to enter different three codes, just enter (482)-555-0100 into Niko's cell phone.

Cheats

While playing, Press Up on the D-pad to bring up Niko's cellphone. Press Up again and you'll get the keypad to enter the cheats on. Once you enter a cheat successfully, a Cheat menu will appear on the phone now, and you can enter the menu to toggle the codes on or off. Don't save your game or continue progress with these cheats on, you won't get a lot of achievements.

Full health
Dial "3625550100"

Full health and ammunition
Dial "4825550100"

Weapon Group 1
Dial "4865550100"

Weapon Group 2
Dial "4865550150"

Remove Niko's wanted level
Dial "2675550100"

Add to Niko's wanted level
Dial "2675550150"

Spawn Annihilator police helicopter
Dial "3595550100"

Spawn Cognoscenti
Dial "2275550142"

Spawn Comet
Dial "2275550175"

Spawn Buffalo
Dial "2275550100"

Spawn Jetmax
Dial "9385550100"

Spawn NRG-900
Dial "6255550100"

Spawn Sanchez
Dial "6255550150"

Spawn SuperGT
Dial "2275550168"

Spawn Turismo
Dial "2275550147"

Change weather and brightness
Dial "4685550100"