If u wish to use cracked ngage games, you must uninstall your current ngage application, then follow this tutorial:
http://redpepper007.ucoz.com/news/2008-11-13-7 and to keep your saved games (I think this is what u meant by ''game data''), do this:
Always make a back-up of all the files and folder in ("C:\private\20007b39"). Then place it back again, overwrite, to bring it back. this is good when updating the N-Gage application or changing phones.
OR you could try to back-up these folders separately ("C:\private\20007b39"):
2000afb9 - System Rush: Evolution
2000afbb - Space Impact Kappa Base
2000afbc - Hooked On: Creatures of the Deep
2000afbd - Snakes Subsonic
2000afbe - Mile High Pinball
2000afda - EA SPORTS™ FIFA 08
2000afdb - Tetris®
2000afe3 - Asphalt 3: Street Rules™
2000afe5 - Block Breaker Deluxe
2000b4b3 - Brain Challenge™
2000afd9 - World Series of Poker® Pro Challenge
2000afde - Sims 2 Pets
2000AFE4 - Brothers in Arms
2000AFBA - Pro Series Golf
2000B4B2 - Midnight Pool
2000AFC0 - Bounce
2000AFC4 - Reset Generation
2000AFC3 - Jadestone Dirk Dagger And The Fallen idol
Read more: http://redpepper007.ucoz.com/news/2009-12-22-87#ixzz0c5wGsfDk