N-Gage Hardware (NGage)

N-Gage Hardware cheats:

Alternate starting sounds
Hold Z + L + R + Start and turn on the N-Gage to hear children's music following by a "boing" sound.

Change the background
Turn on your N-Gage and wait for it to load, Then, press Menu. When the menu appears, scroll to "Tools". After the tools screen appears, select "Settings", then "Devices", then "Standby Mode", and "Background Image". Select it to switch the background off, then switch it back on. When you put it back on, you can chose one of the pictures that comes with the N-Gage, or one from a MMC card to use as a background. Note: Use the T-Mobile card that comes with it to login to n-gage.com on your N-Gage, save all the pictures on the site to your N-Gage or MMC card, then you can later use them as backgrounds.

Play FloBoarder
Press MENU and select the jigsaw puzzle piece. Select NO to play FloBoarder game without previously registering on a GPRS service. Note: This can only be done on phones with the 32MB memory card featuring a woman with a snowboard.

Other Sites you may consider
CheatServer.Com
Cheat Codes Club