Some secret tips and tricks and codes for symbian based nokia mobile

To know the IMEI (International Mobile Equipment Identity) No.: *#06#
To check the phones Software revision - *#0000#
To enter the service menu type - *#92702689#
Clock Stopping - *#746025625#

#06# - Display the IMEI (GSM standard)
*#0000# - Display the firmware version and date
*#bta0# - Display the Bluetooth MAC address (models with build-in Bluetooth radio, activate first to show address)
*#mac0wlan# - Display the WLAN MAC address (models with build-in Wi-fi radio)
*#opr0logo# - Clear the operator logo (3310 and 3330 only)
*#pca0# - Activate the GPRS PCCCH support (early GPRS models)
*#pcd0# - Deactivate the GPRS PCCCH support (early GPRS models)
*#res0wallet# - Reset the mobile wallet (models with mobile wallet)
*#res0# - Soft-format the memory (Symbian models only)
*#rst0# - Reset to factory defaults, confirmation required (DCT4 or newer)
*#sim0clock# - Display the SIM clock status (DCT3 only)
*#ssn0# - Display the manufacturing serial number (mid-range and premium, non-Symbian models, and those devired from them)
*#war0anty# - Display the manufacturing and repair info (no exit on DCT3)
*efr0# - Enable EFR encoding (pre-2003 models)
#efr0# - Disable EFR encoding (pre-2003 models)
*hra0# - Enable HR encoding (pre-2003 models)
#hra0# - Disable HR encoding (pre-2003 models)

#pw+1234567890+n#
Display the SIM lock status: (pre-2003 models)
n = 1: provider lock
n = 2: network lock
n = 3: country lock
n = 4: SIM lock