*#06# Displays your IMEI
*#78# Test touch configurations , Sort of an Admin menu.
*#03# Displays a Unique number, specific for your phone I guess.
*#7465625# Phone lock status
*#232337# Bluetooth MAC Address
*#1234# Software Version running on your phone.
*#2222# Hardware Version of your phone.
*#0228# Displays battery information.
*#0289# Melody test
*#0782# Displays the real time clock of your phone.
*2767*2878# Displays a Service menu.(seems like it contains all the goodies :D )
*2767*3855# Beware: This code performs a full reset. Use it only when you are screwed up.
*#0842# Vibration test
*#0*# Speaker & LCD display Tests