Go to the main menu and press R1 + L1 before you enter the codes.
You'll need to re-enter the codes every time you turn the game on.

Cheat code:                  Description:
Left, Right, Left, Right     Unlock All Teams 
Up, Right, Down, Left        Unlock All Courts


Unlockables

Unlockable              How to Unlock
Brand Jordan Outfit 2   Get 10 blocks in a game.
Brand Jordan Outfit 4   Get 10 steals in a game.
Chicago All-Stars       Defeat the Chicago Bulls in a Back To Basics game.
Detroit All-Stars       Defeat the Detroit Pistons in a GB Battle.
Los Angeles All-Stars   Defeat the Los Angeles Lakers in a Pick Up game.
New Jersey All-Stars    Defeat the New Jersey Nets in a Trick Battle.
New York All-Stars      Defeat the New York Knicks in a GB Battle.
Oakland All-Stars       Defeat the Golden State Warriors in a Trick Battle.
Jordan 9.5 Team         Win 5 Back To Basics games.
Jordan Hoops Lo         Win 15 Back To Basics games.
Jordan Laney 23         Win 30 Back To Basics games.
Jordan 9.5 Team         Win 5 GB Battles.
Jordan Hoops Lo         Win 15 GB Battles.
Jordan Show Em Lo       Win 30 GB Battles.
Jordan XXI PE           Win 100 Pick Up games.

Unlockables

Unlockable              How to Unlock
Jordan 9.5 Team         Win 5 Pick Up games.
Jordan 9.5 Team         Win 5 Trick Battles.
Jordan Hoops Lo         Win 15 Pick Up games.
Jordan Hoops Lo         Win 15 Trick Battles.
Jordan Show Em Lo       Win 30 Trick Battles.
Jordan Laney 23         Win 30 Pick Up games.