Unlock Jermaine Dupri
Create a player with "SOSODEF" as his last name, and message will appear saying that you've unlocked him.

Unlock Secret Characters
Create a player with one of the following as his last name. The character will be available in the free agent pool. (Note: Enter these last names in lowercase.)

posneghx - Mario Austin
skenxido - Malick Badiane
zxccvdri - Sani Becirovic
bbvdkcvm - Matt Bonner
sdfgurkl - Carlos Delfino
pockdlek - Andreas Glyniadakis
oeisndla - Kyle Korver
nbvksmcn - James Lang
qwpoaszx - Paccelis Morlende
whsucpoi - Aleksander Pavlovic
poilkjmn - Rick Rickert
ioubfdcj - Sofoklis Schortsanitis
xcfwqase - Tommy Smith
poioijis - Szymon Szewczyk
zxdsdrke - Nedzad Sinanovic
itnvcjsd - Remon Van de Hare
wmzkcoi - Xue Yuyang

Unlock Shoes
Enter these NBA Codes to unlock special Nike shoes (the colorway style are in parentheses):

Air Flight 89 (3)- GF9845JHR4
Air Flightposite II (2) - 2389JASE3E
Air Foamposite - OP5465UX12
Air Foamposite Pro (1) - DG56TRF446
Air Foamposite Pro (2) - 3245AFSD45
Air Foamposite Pro (3) - DSAKF38422
Air Hyperflight (3) - A0K374HF8S
Air Hyperflight (4) - JCX93LSS88
Shox BB4 - 424TREU777
Blazer - XCV6456NNL
Air Jordan III - CVJ554TJ58

Getting Great Players
While playing in dynasty mode, after the first off-season, pick up free agents that have an overall rating of 65 or over. Next, trade the players that you've just picked up for a great player and two horrible players (by horrible I mean having an overall rating of 30 to 40). They should accept your trade.

All Shoes
Select the "My NBA" opition, then "NBA codes", and enter 725JKUPLMM as a code.

Get Lebron Jame's shoes
Go to My NBA Live, and then go to Enter Codes, and then type in 23LBJNUMB1.