here some I know...

*#7370# - Full RESET


Activate Call waiting: *43# press phone button
Deactivate Call waiting: #43#
Check Status: *#43#

Bluetooth Device ID *#2820#
Firmware Version *#0000#

*#06# - International Mobile Equipment Identity ( = IMEI )
A ( Type Approval Code ), B ( Final Assembly Code ), C ( Serial Number ), D ( Spare )

know any other? Just write them down here.