Go to the cheat codes section/menu and enter one of the following codes
Bonus +3 Ball Handling : spriteeffect
Secondary Uniform : ypzbnwolaw
Christmas Uniforms : mnspxuwndy
ABA Ball : payrespect
UA Torch Shoe : underarmour
Unlock Under Armour Spine Bionic Shoe
To unlock the UnderArmour Spine Bionic Shoe, you must complete the Under Armor Training Camp.
Unlock Under Armour Charge BB Kicks
To get the UnderArmor Charge BB Kicks unlocked, you have to get the "Raining 3's" achievement/trophy.