SECRET CODE FOR NOKIA *#06# To check the IMEI. *#0000# To check the firmware version and date . *#92702689# *#war0anty# To check the IMEI. The date when it was purchased and the date when it was repaired. *4720# (*hra0#) To activates the Half Rate. #4720# (#hra0#) To deactivates Half Rate. *#3370# (*efr0#) To activates Enhanced Full Rate. *#746085685# (*#sim0clock#) To check the SIM clock status. *#7220# (*#pca0#) To activate the GPRS and Packet Common Control Channel(PCCCH) supports. *#7230# (*#pcd0#) To deactivate the GPRS and Packet common control channel (PCCCH)supports. *#7760# (*#ssn0#) To check the manufacturing serial number. *#2820# (*#bta0#) To check the Bluetooth MAC address (Phone must have a built in bluetooth adapter). *#7370925538# (*#res0wallet#) Reset the mobile wallet.