I have some secret codes to tell you for Nokia symbian mobiles. Here u go...
Nokia Symbian Base Secret Codes :
*#06# - If u want to know your IMEI (International Mobile Equipment Identity), please type this code on your phone.
*#0000# - If u want to know about your phones Software revision, type this code.
*#92702689# - If u want to enter the service menu, type this code.
*#746025625# - Okay here the last one, this code use for stopping a clock on your mobile.
Thats all, enjoying your phone :)